Imported from libpng-1.2.3rc6.tar

Imported from libpng-1.2.3rc5.tar
Imported from libpng-1.2.3rc4.tar
2025-07-10 18:04:09 +02:00 · 2009-04-06 16:07:08 -05:00 · 2009-04-06 16:07:06 -05:00 · 2009-04-06 16:07:04 -05:00 · 2009-04-06 16:07:02 -05:00 · 2009-04-06 16:07:00 -05:00
81 changed files with 3531 additions and 858 deletions
--- a/68
+++ b/68
@@ -1,28 +1,58 @@

-Libpng 1.2.1beta4 - November 7, 2001
+Libpng 1.2.3rc6 - May 13, 2002

 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.

-Changes since the last public release (1.2.0):
+Changes since the last public release (1.2.2):

-version 1.2.1beta1 [October 19, 2001]
-  Revised makefile.std in contrib/pngminus
-  Include background_1 in png_struct regardless of gamma support.
-  Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
-  Revised example.c to provide more details about using row_callback().
-version 1.2.1beta2 [October 25, 2001]
-  Added type cast to each NULL appearing in a function call, except for
-    WINCE functions.
-  Added makefile.so9.
-version 1.2.1beta3 [October 27, 2001]
-  Removed type casts from all NULLs.
-  Simplified png_create_struct_2().
-version 1.2.1beta4 [November 7, 2001]
-  Revised png_create_info_struct() and png_creat_struct_2().
-  Added error message if png_write_info() was omitted.
-  Type cast NULLs appearing in function calls when _NO_PROTO or
-    PNG_TYPECAST_NULL is defined.
+version 1.2.2patch03 [April 18, 2002]
+  Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and makefile.sggcc
+  Fixed VER -> PNGVER typo in makefile.macosx and added install-static to install
+  Added install: target to makefile.32sunu and makefile.64sunu
+  Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
+    subdirectory to libpngNN subdirectory without the full pathname.
+  Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
+version 1.2.3rc1 [April 27, 2002]
+  Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
+  Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
+  Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
+  Updated cygwin-specific portion of pngconf.h and revised makefile.cygwin
+  Added a link from libpngNN.pc to libpng.pc in 15 makefiles.
+  Added links from include/libpngNN/*.h to include/*.h in 24 makefiles.
+  Revised makefile.darwin to make relative links without full pathname.
+  Added setjmp() at the end of png_create_*_struct_2() in case user forgets
+    to put one in their application.
+  Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
+    removed them from module definition files.
+version 1.2.3rc2 [May 1, 2002]
+  Fixed bug in reporting number of channels in pngget.c and pngset.c,
+    that was introduced in version 1.2.2beta5.
+  Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
+    png_default_flush(), and png_push_fill_buffer() and included them in
+    module definition files.
+  Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
+version 1.2.3rc3 [May 1, 2002]
+  Revised prototype for png_default_flush()
+  Remove old libpng.pc and libpngNN.pc before installing new ones.
+version 1.2.3rc4 [May 2, 2002]
+  Typos in *.def files (png_default_read|write -> png_default_read|write_data)
+  In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
+  Added libpng-config and libpngNN-config and modified makefiles to install them.
+  Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
+  Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
+version 1.2.3rc5 [May 11, 2002]
+  Changed "error" and "message" in prototypes to "error_message" and
+    "warning_message" to avoid namespace conflict.
+  Revised 15 makefiles to build libpng-config from libpng-config-*.in
+  Once more restored png_zalloc and png_zfree to nonexported form.
+  Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
+    to nonexported form, but with PNGAPI, and removed them from module def files.
+version 1.2.3rc6 [May 13, 2002]
+  Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
+  Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
+  Removed leftover libpng-config "sed" script from four makefiles.
+  Revised libpng-config creating script in 16 makefiles.

 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
--- a/120
+++ b/120
@@ -998,6 +998,126 @@ version 1.2.1beta4 [November 7, 2001]
  Added error message if png_write_info() was omitted.
  Type cast NULLs appearing in function calls when _NO_PROTO or
    PNG_TYPECAST_NULL is defined.
+version 1.2.1rc1 [November 24, 2001]
+  Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL
+    is defined.
+  Changed typecast of "size" argument to png_size_t in pngmem.c calls to
+    the user malloc_fn, to agree with the prototype in png.h
+  Added a pop/push operation to pnggccrd.c, to preserve Eflag (Maxim Sobolev)
+  Updated makefile.sgi to recognize LIBPATH and INCPATH.
+  Updated various makefiles so "make clean" does not remove previous major
+    version of the shared library.
+version 1.2.1rc2 [December 4, 2001]
+  Always allocate 256-entry internal palette, hist, and trans arrays, to
+    avoid out-of-bounds memory reference caused by invalid PNG datastreams.
+  Added a check for prefix_length > data_length in iCCP chunk handler.
+version 1.2.1 [December 7, 2001]
+  None.
+version 1.2.2beta1 [February 22, 2002]
+  Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
+  Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate
+    libpng.a, libpng12.so (not libpng.so.3), and libpng12/png.h
+  Revised makefile.darwin to remove "-undefined suppress" option.
+  Added checks for gamma and chromaticity values over 21474.83, which exceed
+    the limit for PNG unsigned 32-bit integers when encoded.
+  Revised calls to png_create_read_struct() and png_create_write_struct()
+    for simpler debugging.
+  Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
+version 1.2.2beta2 [February 23, 2002]
+  Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
+  Check for invalid image dimensions in png_get_IHDR.
+  Added missing "fi;" in the install target of the SGI makefiles.
+  Added install-static to all makefiles that make shared libraries.
+  Always do gamma compensation when image is partially transparent.
+version 1.2.2beta3 [March 7, 2002]
+  Compute background.gray and background_1.gray even when color_type is RGB
+    in case image gets reduced to gray later.
+  Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
+  Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
+  Removed unused png_write_destroy_info prototype from png.h
+  Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
+  Added install-shared target to all makefiles that make shared libraries.
+  Stopped a double free of palette, hist, and trans when not using free_me.
+  Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
+version 1.2.2beta4 [March 8, 2002]
+  Compute background.gray and background_1.gray even when color_type is RGB
+    in case image gets reduced to gray later (Jason Summers).
+  Relocated a misplaced /bin/rm in the "install-shared" makefile targets
+  Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
+version 1.2.2beta5 [March 26, 2002]
+  Added missing PNGAPI to several function definitions.
+  Check for invalid bit_depth or color_type in png_get_IHDR(), and
+    check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
+  Revised iTXt support to accept NULL for lang and lang_key.
+  Compute gamma for color components of background even when color_type is gray.
+  Changed "()" to "{}" in scripts/libpng.pc.in.
+  Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
+  Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so
+version 1.2.2beta6 [March 31, 2002]
+version 1.0.13beta1 [March 31, 2002]
+  Prevent png_zalloc() from trying to memset memory that it failed to acquire.
+  Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
+  Ensure that the right function (user or default) is used to free the
+    png_struct after an error in png_create_read_struct_2().
+version 1.2.2rc1 [April 7, 2002]
+version 1.0.13rc1 [April 7, 2002]
+  Save the ebx register in pnggccrd.c (Sami Farin)
+  Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
+  Updated makefiles to put headers in include/libpng and remove old include/*.h.
+version 1.2.2 [April 15, 2002]
+version 1.0.13 [April 15, 2002]
+  Revised description of png_set_filter() in libpng.3/libpng.txt.
+  Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
+version 1.0.13patch01 [April 17, 2002]
+version 1.2.2patch01 [April 17, 2002]
+  Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and makefile.sggcc
+  Fixed VER -> PNGVER typo in makefile.macosx and added install-static to install
+  Added install: target to makefile.32sunu and makefile.64sunu
+version 1.0.13patch03 [April 18, 2002]
+version 1.2.2patch03 [April 18, 2002]
+  Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
+  subdirectory to libpngNN subdirectory without the full pathname.
+  Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
+version 1.2.3rc1 [April 28, 2002]
+  Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
+  Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
+  Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
+  Updated cygwin-specific portion of pngconf.h and revised makefile.cygwin
+  Added a link from libpngNN.pc to libpng.pc in 15 makefiles.
+  Added links from include/libpngNN/*.h to include/*.h in 24 makefiles.
+  Revised makefile.darwin to make relative links without full pathname.
+  Added setjmp() at the end of png_create_*_struct_2() in case user forgets
+    to put one in their application.
+  Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
+    removed them from module definition files.
+version 1.2.3rc2 [May 1, 2002]
+  Fixed bug in reporting number of channels in pngget.c and pngset.c,
+    that was introduced in version 1.2.2beta5.
+  Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
+    png_default_flush(), and png_push_fill_buffer() and included them in
+    module definition files.
+  Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
+version 1.2.3rc3 [May 1, 2002]
+  Revised prototype for png_default_flush()
+  Remove old libpng.pc and libpngNN.pc before installing new ones.
+version 1.2.3rc4 [May 2, 2002]
+  Typos in *.def files (png_default_read|write -> png_default_read|write_data)
+  In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
+  Added libpng-config and libpngNN-config and modified makefiles to install them.
+  Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
+  Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
+version 1.2.3rc5 [May 11, 2002]
+  Changed "error" and "message" in prototypes to "error_message" and
+    "warning_message" to avoid namespace conflict.
+  Revised 15 makefiles to build libpng-config from libpng-config-*.in
+  Once more restored png_zalloc and png_zfree to regular nonexported form.
+  Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
+    to nonexported form, but with PNGAPI, and removed them from module def files.
+version 1.2.3rc6 [May 13, 2002]
+  Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
+  Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
+  Removed leftover libpng-config "sed" script from four makefiles.
+  Revised libpng-config creating script in 16 makefiles.

 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
--- a/21
+++ b/21
@@ -1,5 +1,5 @@

-Installing libpng version 1.2.1beta4 - November 7, 2001
+Installing libpng version 1.2.3rc6 - May 13, 2002

 Before installing libpng, you must first install zlib.  zlib
 can usually be found wherever you got libpng.  zlib can be
@@ -10,7 +10,7 @@ zlib.h and zconf.h include files that correspond to the
 version of zlib that's installed.

 You can rename the directories that you downloaded (they
-might be called "libpng-1.2.1beta4" or "lpng109" and "zlib-1.1.3"
+might be called "libpng-1.2.3rc6" or "lpng109" and "zlib-1.1.3"
 or "zlib113") so that you have directories called "zlib" and "libpng".

 Your directory structure should look like this:
@@ -64,8 +64,8 @@ The files that are presently available in the scripts directory
 include

 makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
- makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.3.1.2.1beta4)
- makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.3.1.2.1beta4,
+ makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng12.so.0.1.2.3rc6)
+ makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng12.so.0.1.2.3rc6,
                       uses assembler code tuned for Intel MMX platform)
 makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
 makefile.knr      =>  Archaic UNIX Makefile that converts files with
@@ -75,18 +75,23 @@ include
 makefile.cygwin   =>  Cygwin/gcc makefile
 makefile.darwin   =>  Darwin makefile
 makefile.dec      =>  DEC Alpha UNIX makefile
+ makefile.hpgcc    =>  FreeBSD makefile
 makefile.hpgcc    =>  HPUX makefile using gcc
 makefile.hpux     =>  HPUX (10.20 and 11.00) makefile
 makefile.ibmc     =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
 makefile.intel    =>  Intel C/C++ version 4.0 and later
 libpng.icc        =>  Project file for IBM VisualAge/C++ version 4.0 or later
 makefile.macosx   =>  MACOS X Makefile
- makefile.netbsd   =>  NetBSD/cc makefile, uses PNGGCCRD
+ makefile.netbsd   =>  NetBSD/cc makefile, uses PNGGCCRD, makes libpng.so.
+ makefile.ne0bsd  =>  NetBSD/cc makefile, uses PNGGCCRD, makes libpng0.so
+ makefile.openbsd  =>  OpenBSD makefile
 makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
- makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng.so.3.1.2.1beta4)
+ makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng12.so.0.1.2.3rc6)
 makefile.sunos    =>  Sun makefile
- makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.3.1.2.1beta4)
- makefile.so9      =>  Solaris 9 makefile (gcc, creates libpng.so.3.1.2.1beta4)
+ makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng12.so.0.1.2.3rc6)
+ makefile.so9      =>  Solaris 9 makefile (gcc, creates libpng12.so.0.1.2.3rc6)
+ makefile.32sunu   =>  Sun Ultra 32-bit makefile
+ makefile.64sunu   =>  Sun Ultra 64-bit makefile
 makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
 makefile.mips     =>  MIPS makefile
 makefile.acorn    =>  Acorn makefile
--- a/5
+++ b/5
@@ -1,8 +1,9 @@

-Known bugs in libpng-1.2.0
+Known bugs in libpng version 1.2.3rc6

 1. April 22, 2001: pnggccrd.c has been reported to crash on NetBSD when
   reading interlaced PNG files, when assembler code is enabled.

-   STATUS: Under investigation.
+   STATUS: Under investigation.  The change to pnggccrd.c in libpng-1.2.1
+   fixed a problem under FreeBSD but not the problem with NetBSD.

--- a/6
+++ b/6
@@ -8,8 +8,8 @@ COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
 If you modify libpng you may insert additional notices immediately following
 this sentence.

-libpng versions 1.0.7, July 1, 2000, through 1.2.1beta4, November 7, 2001, are
-Copyright (c) 2000 Glenn Randers-Pehrson
+libpng versions 1.0.7, July 1, 2000, through 1.2.3rc6, May 13, 2002, are
+Copyright (c) 2000-2002 Glenn Randers-Pehrson
 and are distributed according to the same disclaimer and license as libpng-1.0.6
 with the following individuals added to the list of Contributing Authors

@@ -99,4 +99,4 @@ certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 randeg@alum.rpi.edu
-November 7, 2001
+May 13, 2002
--- a/19
+++ b/19
@@ -1,4 +1,4 @@
-README for libpng 1.2.1beta4 - November 7, 2001 (shared library 2.1)
+README for libpng 1.2.3rc6 - May 13, 2002 (shared library 2.1)
 See the note about version numbers near the top of png.h

 See INSTALL for instructions on how to install libpng.
@@ -187,9 +187,9 @@ Files in this distribution:
       descrip.mms      =>  VMS makefile for MMS or MMK
       makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
       makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng.so.3.1.2.1beta4)
+                            (gcc, creates libpng12.so.0.1.2.3rc6)
       makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
-                            libpng.so.3.1.2.1beta4, uses assembler code
+                            libpng12.so.0.1.2.3rc6, uses assembler code
                            tuned for Intel MMX platform)
       makefile.gcc     =>  Generic makefile (gcc, creates static libpng.a)
       makefile.knr     =>  Archaic UNIX Makefile that converts files with
@@ -199,20 +199,25 @@ Files in this distribution:
       makefile.cygwin  =>  Cygwin/gcc makefile
       makefile.darwin  =>  Darwin makefile
       makefile.dec     =>  DEC Alpha UNIX makefile
+       makefile.freebsd =>  FreeBSD makefile
       makefile.hpgcc   =>  HPUX makefile using gcc
       makefile.hpux    =>  HPUX (10.20 and 11.00) makefile
       makefile.ibmc    =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
       makefile.intel   =>  Intel C/C++ version 4.0 and later
       libpng.icc       =>  Project file, IBM VisualAge/C++ 4.0 or later
       makefile.macosx  =>  MACOS X Makefile
-       makefile.netbsd  =>  NetBSD/cc makefile, uses PNGGCCRD
+       makefile.netbsd  =>  NetBSD/cc makefile, PNGGCCRD, makes libpng.so.
+       makefile.ne0bsd =>  NetBSD/cc makefile, PNGGCCRD, makes libpng0.so
+       makefile.openbsd =>  OpenBSD makefile
       makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
-       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng.so.3.1.2.1beta4)
+       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng12.so.0.1.2.3rc6)
       makefile.sunos   =>  Sun makefile
       makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng.so.3.1.2.1beta4)
+                            (gcc, creates libpng12.so.0.1.2.3rc6)
       makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng.so.3.1.2.1beta4)
+                            (gcc, creates libpng12.so.0.1.2.3rc6)
+       makefile.32sunu  =>  Sun Ultra 32-bit makefile
+       makefile.64sunu  =>  Sun Ultra 64-bit makefile
       makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
       makefile.mips    =>  MIPS makefile
       makefile.acorn   =>  Acorn makefile
--- a/4
+++ b/4
@@ -1,13 +1,13 @@
   Y2K compliance in libpng:
   =========================

-      November 7, 2001
+      May 13, 2002

      Since the PNG Development group is an ad-hoc body, we can't make
      an official declaration.

      This is your unofficial assurance that libpng from version 0.71 and
-      upward through 1.2.1beta4 are Y2K compliant.  It is my belief that earlier
+      upward through 1.2.3rc6 are Y2K compliant.  It is my belief that earlier
      versions were also Y2K compliant.

      Libpng only has three year fields.  One is a 2-byte unsigned integer
--- a/2
+++ b/2
@@ -1,5 +1,5 @@
 echo "
-  There is no \"configure\" script for Libpng-1.2.1beta4.  Instead, please
+  There is no \"configure\" script for Libpng-1.2.3rc6.  Instead, please
  copy the appropriate makefile for your system from the \"scripts\"
  directory.  Read the INSTALL file for more details.
 "
--- a/contrib/gregbook/Makefile.sgi
+++ b/contrib/gregbook/Makefile.sgi
@@ -1,6 +1,6 @@
 # Sample makefile for rpng-x / rpng2-x / wpng for SGI using cc and make.
 # Greg Roelofs
-# Last modified:  16 January 1000
+# Last modified:  7 March 2002
 #
 #	The programs built by this makefile are described in the book,
 #	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
@@ -23,9 +23,9 @@

 # macros --------------------------------------------------------------------

-PNGINC = -I/usr/local/include
-PNGLIB = -L/usr/local/lib -lpng	# dynamically linked against libpng
-#PNGLIB = /usr/local/lib/libpng.a	# statically linked against libpng
+PNGINC = -I/usr/local/include/libpng12
+PNGLIB = -L/usr/local/lib -lpng12	  # dynamically linked against libpng
+#PNGLIB = /usr/local/lib/libpng12.a # statically linked against libpng
 # or:
 #PNGINC = -I../..
 #PNGLIB = -L../.. -lpng
--- a/contrib/gregbook/Makefile.unx
+++ b/contrib/gregbook/Makefile.unx
@@ -1,6 +1,6 @@
 # Sample makefile for rpng-x / rpng2-x / wpng using gcc and make.
 # Greg Roelofs
-# Last modified:  7 February 2001
+# Last modified:  7 March 2002
 #
 #	The programs built by this makefile are described in the book,
 #	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
@@ -23,9 +23,9 @@

 # macros --------------------------------------------------------------------

-PNGINC = -I/usr/local/include
-#PNGLIB = -L/usr/local/lib -lpng	# dynamically linked against libpng
-PNGLIB = /usr/local/lib/libpng.a	# statically linked against libpng
+PNGINC = -I/usr/local/include/libpng12
+#PNGLIB = -L/usr/local/lib -lpng12 # dynamically linked against libpng
+PNGLIB = /usr/local/lib/libpng12.a # statically linked against libpng
 # or:
 #PNGINC = -I../libpng
 #PNGLIB = -L../libpng -lpng
--- a/contrib/gregbook/toucan.png
+++ b/contrib/gregbook/toucan.png
--- a/contrib/msvctest/msvctest.dsp
+++ b/contrib/msvctest/msvctest.dsp
@@ -54,7 +54,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /subsystem:console /machine:I386
-# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll\libpng3.lib /nologo /subsystem:console /machine:I386
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll\libpng12.lib /nologo /subsystem:console /machine:I386
 # Begin Special Build Tool
 OutDir=.\dll
 SOURCE="$(InputPath)"
@@ -84,7 +84,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_dbg\libpng3d.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_dbg\libpng12d.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 # Begin Special Build Tool
 OutDir=.\dll_dbg
 SOURCE="$(InputPath)"
@@ -114,7 +114,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /subsystem:console /machine:I386
-# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_asm\libpng3a.lib /nologo /subsystem:console /machine:I386
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_asm\libpng12a.lib /nologo /subsystem:console /machine:I386
 # Begin Special Build Tool
 OutDir=.\dll_asm
 SOURCE="$(InputPath)"
@@ -144,7 +144,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_dbga\libpng3b.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_dbga\libpng12b.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 # Begin Special Build Tool
 OutDir=.\dll_dbga
 SOURCE="$(InputPath)"
--- a/contrib/pngminus/makefile.std
+++ b/contrib/pngminus/makefile.std
@@ -8,9 +8,9 @@ LD=$(CC)
 RM=rm -f

 #PNGPATH = /usr/local
-#PNGINC = -I$(PNGPATH)/include
-#PNGLIB = -L$(PNGPATH)/lib -lpng
-#PNGLIBS = $(PNGPATH)/lib/libpng.a
+#PNGINC = -I$(PNGPATH)/include/libpng12
+#PNGLIB = -L$(PNGPATH)/lib -lpng12
+#PNGLIBS = $(PNGPATH)/lib/libpng12.a
 PNGINC = -I../..
 PNGLIB = -L../.. -lpng
 PNGLIBS = ../../libpng.a
--- a/contrib/pngminus/png2pnm.sh
+++ b/contrib/pngminus/png2pnm.sh
--- a/contrib/pngminus/pngminus.sh
+++ b/contrib/pngminus/pngminus.sh
--- a/contrib/pngminus/pnm2png.sh
+++ b/contrib/pngminus/pnm2png.sh
--- a/contrib/visupng/VisualPng.dsp
+++ b/contrib/visupng/VisualPng.dsp
@@ -59,8 +59,8 @@ BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
 LINK32=link.exe
-# ADD BASE LINK32 libpng3.lib zlibd.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"libpng" /libpath:"zlib"
-# ADD LINK32 libpng3.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\dll"
+# ADD BASE LINK32 libpng12.lib zlibd.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"libpng" /libpath:"zlib"
+# ADD LINK32 libpng12.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\dll"
 # Begin Special Build Tool
 OutDir=.\dll
 SOURCE="$(InputPath)"
@@ -92,9 +92,9 @@ BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
 LINK32=link.exe
-# ADD BASE LINK32 libpng3.lib zlibd.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"libpng" /libpath:"zlib"
+# ADD BASE LINK32 libpng12.lib zlibd.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"libpng" /libpath:"zlib"
 # SUBTRACT BASE LINK32 /nodefaultlib
-# ADD LINK32 libpng3d.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\dll_dbg"
+# ADD LINK32 libpng12d.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\dll_dbg"
 # SUBTRACT LINK32 /nodefaultlib
 # Begin Special Build Tool
 OutDir=.\dll_dbg
@@ -128,7 +128,7 @@ BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
 LINK32=link.exe
-# ADD BASE LINK32 libpng3.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\dll"
+# ADD BASE LINK32 libpng12.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\dll"
 # ADD LINK32 libpng.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\lib"
 # Begin Special Build Tool
 OutDir=.\lib
@@ -161,7 +161,7 @@ BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
 LINK32=link.exe
-# ADD BASE LINK32 libpng3d.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\dll_dbg"
+# ADD BASE LINK32 libpng12d.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\dll_dbg"
 # SUBTRACT BASE LINK32 /nodefaultlib
 # ADD LINK32 libpng.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\lib_dbg"
 # SUBTRACT LINK32 /nodefaultlib
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "November 7, 2001"
+.TH LIBPNG 3 "May 13, 2002"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.1beta4
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.3rc6
 .SH SYNOPSIS
 \fI\fB

@@ -318,6 +318,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.2.1beta4

 \fI\fB

+\fBint png_handle_as_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_init_io (png_structp \fP\fIpng_ptr\fP\fB, FILE \fI*fp\fP\fB);\fP

 \fI\fB
@@ -732,10 +736,6 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.2.1beta4

 \fI\fB

-\fBvoid png_write_destroy_info (png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
 \fBvoid png_write_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP

 \fI\fB
@@ -787,10 +787,10 @@ Following is a copy of the libpng.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng

- libpng version 1.2.1beta4 - November 7, 2001
+ libpng version 1.2.3rc6 - May 13, 2002
 Updated and distributed by Glenn Randers-Pehrson
 <randeg@alum.rpi.edu>
- Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ Copyright (c) 1998-2002 Glenn Randers-Pehrson
 For conditions of distribution and use, see copyright
 notice in png.h.

@@ -1364,7 +1364,7 @@ into the info_ptr is returned for any complex types.
                 after decompression, 0 for tEXt/zTXt
    text_ptr[i].lang  - language of comment (empty
                         string for unknown).
-    text_ptr[i].translated_keyword  - keyword in UTF-8
+    text_ptr[i].lang_key  - keyword in UTF-8
                         (empty string for unknown).
    num_text       - number of comments (same as
                     num_comments; you can put NULL here
@@ -1672,8 +1672,8 @@ which can be expressed with integers as
 The calculation is done in a linear colorspace, if the image gamma
 is known.

-If you have a grayscale and you are using png_set_expand_depth() or
-png_set_expand() to change to
+If you have a grayscale and you are using png_set_expand_depth(),
+png_set_expand(), or png_set_gray_to_rgb to change to truecolor or to
 a higher bit-depth, you must either supply the background color as a gray
 value at the original file bit-depth (need_expand = 1) or else supply the
 background color as an RGB triplet at the final, expanded bit depth
@@ -3106,7 +3106,7 @@ This function also provides a void pointer that can be retrieved via
 Your replacement memory functions must have prototypes as follows:

    png_voidp malloc_fn(png_structp png_ptr,
-       png_uint_32 size);
+       png_size_t size);
    void free_fn(png_structp png_ptr, png_voidp ptr);

 Your malloc_fn() can return NULL in case of failure.  The png_malloc()
@@ -3135,9 +3135,9 @@ png_get_io_ptr().  For example:
 The replacement I/O functions must have prototypes as follows:

    void user_read_data(png_structp png_ptr,
-        png_bytep data, png_uint_32 length);
+        png_bytep data, png_size_t length);
    void user_write_data(png_structp png_ptr,
-        png_bytep data, png_uint_32 length);
+        png_bytep data, png_size_t length);
    void user_flush_data(png_structp png_ptr);

 Supplying NULL for the read, write, or flush functions sets them back
@@ -3272,6 +3272,10 @@ compression level by calling:
 Another useful one is to reduce the memory level used by the library.
 The memory level defaults to 8, but it can be lowered if you are
 short on memory (running DOS, for example, where you only have 640K).
+Note that the memory level does have an effect on compression; among
+other things, lower levels will result in sections of incompressible
+data being emitted in smaller stored blocks, with a correspondingly
+larger relative overhead of up to 15% in the worst case.

    png_set_compression_mem_level(png_ptr, level);

@@ -3306,19 +3310,18 @@ to turn filtering on and off, respectively.
 Individual filter types are PNG_FILTER_NONE, PNG_FILTER_SUB,
 PNG_FILTER_UP, PNG_FILTER_AVG, PNG_FILTER_PAETH, which can be bitwise
 ORed together with '|' to specify one or more filters to use.
-These filters are described in more detail in the PNG specification.  If
-you intend to change the filter type during the course of writing
+These filters are described in more detail in the PNG specification.
+If you intend to change the filter type during the course of writing
 the image, you should start with flags set for all of the filters
 you intend to use so that libpng can initialize its internal
-structures appropriately for all of the filter types.
+structures appropriately for all of the filter types.  (Note that this
+means the first row must always be adaptively filtered, because libpng
+currently does not allocate the filter buffers until png_write_row()
+is called for the first time.)

    filters = PNG_FILTER_NONE | PNG_FILTER_SUB
              PNG_FILTER_UP | PNG_FILTER_AVE |
              PNG_FILTER_PAETH | PNG_ALL_FILTERS;
-    or
-    filters = one of PNG_FILTER_VALUE_NONE,
-              PNG_FILTER_VALUE_SUB, PNG_FILTER_VALUE_UP,
-              PNG_FILTER_VALUE_AVE, PNG_FILTER_VALUE_PAETH

    png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
       filters);
@@ -3330,16 +3333,16 @@ structures appropriately for all of the filter types.
              in png_set_IHDR().

 It is also possible to influence how libpng chooses from among the
-available filters.  This is done in two ways - by telling it how
-important it is to keep the same filter for successive rows, and
-by telling it the relative computational costs of the filters.
+available filters.  This is done in one or both of two ways - by
+telling it how important it is to keep the same filter for successive
+rows, and by telling it the relative computational costs of the filters.

    double weights[3] = {1.5, 1.3, 1.1},
       costs[PNG_FILTER_VALUE_LAST] =
       {1.0, 1.3, 1.3, 1.5, 1.7};

-    png_set_filter_selection(png_ptr,
-       PNG_FILTER_SELECTION_WEIGHTED, 3,
+    png_set_filter_heuristics(png_ptr,
+       PNG_FILTER_HEURISTIC_WEIGHTED, 3,
       weights, costs);

 The weights are multiplying factors that indicate to libpng that the
@@ -3635,13 +3638,13 @@ application:

 .SH IX. Y2K Compliance in libpng

-November 7, 2001
+May 13, 2002

 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.

 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.2.1beta4 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.3rc6 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.

 Libpng only has three year fields.  One is a 2-byte unsigned integer that
@@ -3762,6 +3765,16 @@ the first widely used release:
 1.2.0rc1             3    10200  3.1.2.0rc1
 1.2.0                3    10200  3.1.2.0
 1.2.1beta-4          3    10201  3.1.2.1beta1-4
+ 1.2.1rc1-2           3    10201  3.1.2.1rc1-2
+ 1.2.1                3    10201  3.1.2.1
+ 1.2.2beta1-6        12    10202  12.so.0.1.2.2beta1-6
+ 1.0.13beta1         10    10013  10.so.0.1.0.13beta1
+ 1.0.13rc1           10    10013  10.so.0.1.0.13rc1
+ 1.2.2rc1            12    10202  12.so.0.1.2.2rc1
+ 1.0.13              10    10013  10.so.0.1.0.13
+ 1.2.2               12    10202  12.so.0.1.2.2
+ 1.2.3rc1-6          12    10203  12.so.0.1.2.3rc1-6
+ 1.2.3               12    10203  12.so.0.1.2.3

 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -3819,7 +3832,7 @@ possible without all of you.

 Thanks to Frank J. T. Wojcik for helping with the documentation.

-Libpng version 1.2.1beta4 - November 7, 2001:
+Libpng version 1.2.3rc6 - May 13, 2002:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (randeg@alum.rpi.edu).

@@ -3836,8 +3849,8 @@ included in the libpng distribution, the latter shall prevail.)
 If you modify libpng you may insert additional notices immediately following
 this sentence.

-libpng versions 1.0.7, July 1, 2000, through  1.2.1beta4, November 7, 2001, are
-Copyright (c) 2000-2001 Glenn Randers-Pehrson, and are
+libpng versions 1.0.7, July 1, 2000, through 1.2.3rc6, May 13, 2002, are
+Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.0.6
 with the following individuals added to the list of Contributing Authors

@@ -3928,7 +3941,7 @@ certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 randeg@alum.rpi.edu
-November 7, 2001
+May 13, 2002

 .\" end of man page

--- a/libpng.txt
+++ b/libpng.txt
@@ -1,9 +1,9 @@
 libpng.txt - A description on how to use and modify libpng

- libpng version 1.2.1beta4 - November 7, 2001
+ libpng version 1.2.3rc6 - May 13, 2002
 Updated and distributed by Glenn Randers-Pehrson
 <randeg@alum.rpi.edu>
- Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ Copyright (c) 1998-2002 Glenn Randers-Pehrson
 For conditions of distribution and use, see copyright
 notice in png.h.

@@ -577,7 +577,7 @@ into the info_ptr is returned for any complex types.
                 after decompression, 0 for tEXt/zTXt
    text_ptr[i].lang  - language of comment (empty
                         string for unknown).
-    text_ptr[i].translated_keyword  - keyword in UTF-8
+    text_ptr[i].lang_key  - keyword in UTF-8
                         (empty string for unknown).
    num_text       - number of comments (same as
                     num_comments; you can put NULL here
@@ -885,8 +885,8 @@ which can be expressed with integers as
 The calculation is done in a linear colorspace, if the image gamma
 is known.

-If you have a grayscale and you are using png_set_expand_depth() or
-png_set_expand() to change to
+If you have a grayscale and you are using png_set_expand_depth(),
+png_set_expand(), or png_set_gray_to_rgb to change to truecolor or to
 a higher bit-depth, you must either supply the background color as a gray
 value at the original file bit-depth (need_expand = 1) or else supply the
 background color as an RGB triplet at the final, expanded bit depth
@@ -2319,7 +2319,7 @@ This function also provides a void pointer that can be retrieved via
 Your replacement memory functions must have prototypes as follows:

    png_voidp malloc_fn(png_structp png_ptr,
-       png_uint_32 size);
+       png_size_t size);
    void free_fn(png_structp png_ptr, png_voidp ptr);

 Your malloc_fn() can return NULL in case of failure.  The png_malloc()
@@ -2348,9 +2348,9 @@ png_get_io_ptr().  For example:
 The replacement I/O functions must have prototypes as follows:

    void user_read_data(png_structp png_ptr,
-        png_bytep data, png_uint_32 length);
+        png_bytep data, png_size_t length);
    void user_write_data(png_structp png_ptr,
-        png_bytep data, png_uint_32 length);
+        png_bytep data, png_size_t length);
    void user_flush_data(png_structp png_ptr);

 Supplying NULL for the read, write, or flush functions sets them back
@@ -2485,6 +2485,10 @@ compression level by calling:
 Another useful one is to reduce the memory level used by the library.
 The memory level defaults to 8, but it can be lowered if you are
 short on memory (running DOS, for example, where you only have 640K).
+Note that the memory level does have an effect on compression; among
+other things, lower levels will result in sections of incompressible
+data being emitted in smaller stored blocks, with a correspondingly
+larger relative overhead of up to 15% in the worst case.

    png_set_compression_mem_level(png_ptr, level);

@@ -2519,19 +2523,18 @@ to turn filtering on and off, respectively.
 Individual filter types are PNG_FILTER_NONE, PNG_FILTER_SUB,
 PNG_FILTER_UP, PNG_FILTER_AVG, PNG_FILTER_PAETH, which can be bitwise
 ORed together with '|' to specify one or more filters to use.
-These filters are described in more detail in the PNG specification.  If
-you intend to change the filter type during the course of writing
+These filters are described in more detail in the PNG specification.
+If you intend to change the filter type during the course of writing
 the image, you should start with flags set for all of the filters
 you intend to use so that libpng can initialize its internal
-structures appropriately for all of the filter types.
+structures appropriately for all of the filter types.  (Note that this
+means the first row must always be adaptively filtered, because libpng
+currently does not allocate the filter buffers until png_write_row()
+is called for the first time.)

    filters = PNG_FILTER_NONE | PNG_FILTER_SUB
              PNG_FILTER_UP | PNG_FILTER_AVE |
              PNG_FILTER_PAETH | PNG_ALL_FILTERS;
-    or
-    filters = one of PNG_FILTER_VALUE_NONE,
-              PNG_FILTER_VALUE_SUB, PNG_FILTER_VALUE_UP,
-              PNG_FILTER_VALUE_AVE, PNG_FILTER_VALUE_PAETH

    png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
       filters);
@@ -2543,16 +2546,16 @@ structures appropriately for all of the filter types.
              in png_set_IHDR().

 It is also possible to influence how libpng chooses from among the
-available filters.  This is done in two ways - by telling it how
-important it is to keep the same filter for successive rows, and
-by telling it the relative computational costs of the filters.
+available filters.  This is done in one or both of two ways - by
+telling it how important it is to keep the same filter for successive
+rows, and by telling it the relative computational costs of the filters.

    double weights[3] = {1.5, 1.3, 1.1},
       costs[PNG_FILTER_VALUE_LAST] =
       {1.0, 1.3, 1.3, 1.5, 1.7};

-    png_set_filter_selection(png_ptr,
-       PNG_FILTER_SELECTION_WEIGHTED, 3,
+    png_set_filter_heuristics(png_ptr,
+       PNG_FILTER_HEURISTIC_WEIGHTED, 3,
       weights, costs);

 The weights are multiplying factors that indicate to libpng that the
@@ -2848,13 +2851,13 @@ application:

 IX. Y2K Compliance in libpng

-November 7, 2001
+May 13, 2002

 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.

 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.2.1beta4 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.3rc6 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.

 Libpng only has three year fields.  One is a 2-byte unsigned integer that
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "November 7, 2001"
+.TH LIBPNGPF 3 "May 13, 2002"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.1beta4
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.3rc6
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
@@ -191,10 +191,6 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.2.1beta4

 \fI\fB

-\fBint png_handle_as_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
-
-\fI\fB
-
 \fBvoid png_handle_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP

 \fI\fB
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "November 7, 2001"
+.TH PNG 5 "May 13, 2002"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
--- a/png.c
+++ b/png.c
@@ -1,8 +1,8 @@

 /* png.c - location for general purpose libpng functions
 *
- * libpng version 1.2.1beta4 - November 7, 2001
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * libpng version 1.2.3rc6 - May 13, 2002
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -13,14 +13,14 @@
 #include "png.h"

 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_1beta4 Your_png_h_is_not_version_1_2_1beta4;
+typedef version_1_2_3rc6 Your_png_h_is_not_version_1_2_3rc6;

 /* Version information for C files.  This had better match the version
 * string defined in png.h.  */

 #ifdef PNG_USE_GLOBAL_ARRAYS
 /* png_libpng_ver was changed to a function in version 1.0.5c */
-const char png_libpng_ver[18] = "1.2.1beta4";
+const char png_libpng_ver[18] = "1.2.3rc6";

 /* png_sig was changed to a function in version 1.0.5c */
 /* Place to hold the signature string for a PNG file. */
@@ -135,13 +135,22 @@ png_check_sig(png_bytep sig, int num)
 }

 /* Function to allocate memory for zlib and clear it to 0. */
-voidpf /* PRIVATE */
+voidpf /* private */
 png_zalloc(voidpf png_ptr, uInt items, uInt size)
 {
   png_uint_32 num_bytes = (png_uint_32)items * size;
-   png_voidp ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
+   png_voidp ptr;
+   png_structp p=png_ptr;
+   png_uint_32 save_flags=p->flags;
+
+   p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
+   ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
+   p->flags=save_flags;

 #ifndef PNG_NO_ZALLOC_ZERO
+   if (ptr == NULL)
+       return ((voidpf)ptr);
+
   if (num_bytes > (png_uint_32)0x8000L)
   {
      png_memset(ptr, 0, (png_size_t)0x8000L);
@@ -157,7 +166,7 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
 }

 /* function to free memory for zlib */
-void /* PRIVATE */
+void /* private */
 png_zfree(voidpf png_ptr, voidpf ptr)
 {
   png_free((png_structp)png_ptr, (png_voidp)ptr);
@@ -345,6 +354,9 @@ if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
 {
    png_free(png_ptr, info_ptr->trans);
    info_ptr->valid &= ~PNG_INFO_tRNS;
+#ifndef PNG_FREE_ME_SUPPORTED
+    png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+#endif
    info_ptr->trans = NULL;
 }
 #endif
@@ -488,6 +500,9 @@ if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
    png_free(png_ptr, info_ptr->hist);
    info_ptr->hist = NULL;
    info_ptr->valid &= ~PNG_INFO_hIST;
+#ifndef PNG_FREE_ME_SUPPORTED
+    png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
+#endif
 }
 #endif

@@ -501,6 +516,9 @@ if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
    png_zfree(png_ptr, info_ptr->palette);
    info_ptr->palette = NULL;
    info_ptr->valid &= ~PNG_INFO_PLTE;
+#ifndef PNG_FREE_ME_SUPPORTED
+    png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
+#endif
    info_ptr->num_palette = 0;
 }

@@ -645,10 +663,10 @@ png_charp PNGAPI
 png_get_copyright(png_structp png_ptr)
 {
   if (png_ptr != NULL || png_ptr == NULL)  /* silence compiler warning */
-   return ((png_charp) "\n libpng version 1.2.1beta4 - November 7, 2001\n\
-   Copyright (c) 1998-2001 Glenn Randers-Pehrson\n\
-   Copyright (c) 1996, 1997 Andreas Dilger\n\
-   Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n");
+   return ((png_charp) "\n libpng version 1.2.3rc6 - May 13, 2002\n\
+   Copyright (c) 1998-2002 Glenn Randers-Pehrson\n\
+   Copyright (c) 1996-1997 Andreas Dilger\n\
+   Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
   return ((png_charp) "");
 }

@@ -663,8 +681,8 @@ png_get_libpng_ver(png_structp png_ptr)
 {
   /* Version of *.c files used when building libpng */
   if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
-      return((png_charp) "1.2.1beta4");
-   return((png_charp) "1.2.1beta4");
+      return((png_charp) "1.2.3rc6");
+   return((png_charp) "1.2.3rc6");
 }

 png_charp PNGAPI
@@ -686,7 +704,7 @@ png_get_header_version(png_structp png_ptr)
 }

 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-int /* PRIVATE */
+int PNGAPI
 png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
 {
   /* check chunk_name and return "keep" value if it's on the list, else 0 */
@@ -714,10 +732,11 @@ png_uint_32 PNGAPI
 png_access_version_number(void)
 {
   /* Version of *.c files used when building libpng */
-   return((png_uint_32) 10201L);
+   return((png_uint_32) 10203L);
 }


+#if !defined(PNG_1_0_X)
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
    /* GRR:  could add this:   && defined(PNG_MMX_CODE_SUPPORTED) */
 /* this INTERNAL function was added to libpng 1.2.0 */
@@ -775,3 +794,4 @@ png_mmx_support(void)
    return -1;
 }
 #endif
+#endif /* PNG_1_0_X */
--- a/png.h
+++ b/png.h
@@ -1,15 +1,14 @@
-
 /* png.h - header file for PNG reference library
 *
- * libpng version 1.2.1beta4 - November 7, 2001
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * libpng version 1.2.3rc6 - May 13, 2002
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
 * Authors and maintainers:
 *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
 *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.2.1beta4 - November 7, 2001: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.3rc6 - May 13, 2002: Glenn
 *  See also "Contributing Authors", below.
 *
 * Note about libpng version numbers:
@@ -79,6 +78,16 @@
 *    1.2.0rc1                 3    10200  3.1.2.0rc1
 *    1.2.0                    3    10200  3.1.2.0
 *    1.2.1beta1-4             3    10201  3.1.2.1beta1-4
+ *    1.2.1rc1-2               3    10201  3.1.2.1rc1-2
+ *    1.2.1                    3    10201  3.1.2.1
+ *    1.2.2beta1-6            12    10202  12.so.0.1.2.2beta1-6
+ *    1.0.13beta1             10    10013  10.so.0.1.0.13beta1
+ *    1.0.13rc1               10    10013  10.so.0.1.0.13rc1
+ *    1.2.2rc1                12    10202  12.so.0.1.2.2rc1
+ *    1.0.13                  10    10013  10.so.0.1.0.13
+ *    1.2.2                   12    10202  12.so.0.1.2.2
+ *    1.2.3rc1-6              12    10203  12.so.0.1.2.3rc1-6
+ *    1.2.3                   12    10203  12.so.0.1.2.3
 *
 *    Henceforth the source version will match the shared-library major
 *    and minor numbers; the shared-library major version number will be
@@ -108,8 +117,8 @@
 * If you modify libpng you may insert additional notices immediately following
 * this sentence.
 *
- * libpng versions 1.0.7, July 1, 2000, through  1.2.1beta4, November 7, 2001, are
- * Copyright (c) 2000, 2001 Glenn Randers-Pehrson, and are
+ * libpng versions 1.0.7, July 1, 2000, through 1.2.3rc6, May 13, 2002, are
+ * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
 * distributed according to the same disclaimer and license as libpng-1.0.6
 * with the following individuals added to the list of Contributing Authors
 *
@@ -213,13 +222,13 @@
 * Y2K compliance in libpng:
 * =========================
 *
- *    November 7, 2001
+ *    May 13, 2002
 *
 *    Since the PNG Development group is an ad-hoc body, we can't make
 *    an official declaration.
 *
 *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.2.1beta4 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.3rc6 are Y2K compliant.  It is my belief that earlier
 *    versions were also Y2K compliant.
 *
 *    Libpng only has three year fields.  One is a 2-byte unsigned integer
@@ -275,19 +284,19 @@
 */

 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.1beta4"
+#define PNG_LIBPNG_VER_STRING "1.2.3rc6"

-#define PNG_LIBPNG_VER_SONUM   3
+#define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  %DLLNUM%

 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   2
-#define PNG_LIBPNG_VER_RELEASE 1
+#define PNG_LIBPNG_VER_RELEASE 3
 /* This should match the numeric part of the final component of
 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */

-#define PNG_LIBPNG_VER_BUILD  4
+#define PNG_LIBPNG_VER_BUILD  6

 #define PNG_LIBPNG_BUILD_ALPHA    1
 #define PNG_LIBPNG_BUILD_BETA     2
@@ -295,14 +304,14 @@
 #define PNG_LIBPNG_BUILD_STABLE   4
 #define PNG_LIBPNG_BUILD_TYPEMASK 7
 #define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with STABLE only */
-#define PNG_LIBPNG_BUILD_TYPE 2
+#define PNG_LIBPNG_BUILD_TYPE 3

 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
 * We must not include leading zeros.
 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
 * version 1.0.0 was mis-numbered 100 instead of 10000).  From
 * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release */
-#define PNG_LIBPNG_VER 10201 /* 1.2.1 */
+#define PNG_LIBPNG_VER 10203 /* 1.2.3 */

 #ifndef PNG_VERSION_INFO_ONLY

@@ -323,7 +332,7 @@ extern "C" {
 * which applications aren't expected to use directly.
 */

-#ifdef PNG_TYPECAST_NULL
+#ifndef PNG_NO_TYPECAST_NULL
 #define int_p_NULL                (int *)NULL
 #define png_bytep_NULL            (png_bytep)NULL
 #define png_bytepp_NULL           (png_bytepp)NULL
@@ -1213,7 +1222,11 @@ struct png_struct_def
    defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
 /* changed from png_byte to png_uint_32 at version 1.2.0 */
+#ifdef PNG_1_0_X
+   png_byte mng_features_permitted;
+#else
   png_uint_32 mng_features_permitted;
+#endif /* PNG_1_0_X */
 #endif

 /* New member added in libpng-1.0.7 */
@@ -1226,13 +1239,13 @@ struct png_struct_def
   png_byte filter_type;
 #endif

-#if defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD)
+#if defined(PNG_1_0_X) || (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD))
 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
   png_uint_32 row_buf_size;
 #endif

 /* New members added in libpng-1.2.0 */
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+#if !defined(PNG_1_0_X) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
   png_byte     mmx_bitdepth_threshold;
   png_uint_32  mmx_rowbytes_threshold;
   png_uint_32  asm_flags;
@@ -1250,10 +1263,10 @@ struct png_struct_def
 };


-/* This prevents a compiler error in png_get_copyright() in png.c if png.c
-   and png.h are both at version 1.2.1beta4
+/* This prevents a compiler error in png.c if png.c and png.h are both at
+   version 1.2.3rc6
 */
-typedef png_structp version_1_2_1beta4;
+typedef png_structp version_1_2_3rc6;

 typedef png_struct FAR * FAR * png_structpp;

@@ -1561,9 +1574,6 @@ extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
 extern PNG_EXPORT(void,png_destroy_write_struct)
   PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));

-/* free any memory used in info_ptr struct (old method - NOT DLL EXPORTED) */
-extern void png_write_destroy_info PNGARG((png_infop info_ptr));
-
 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
 extern void png_write_destroy PNGARG((png_structp png_ptr));

@@ -1856,19 +1866,19 @@ extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,

 /* Fatal error in PNG image of libpng - can't continue */
 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
-   png_const_charp error));
+   png_const_charp error_message));

 /* The same, but the chunk name is prepended to the error string. */
 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
-   png_const_charp error));
+   png_const_charp error_message));

 /* Non-fatal error in libpng.  Can continue, but may have a problem. */
 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
-   png_const_charp message));
+   png_const_charp warning_message));

 /* Non-fatal error in libpng, chunk name is prepended to message. */
 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
-   png_const_charp message));
+   png_const_charp warning_message));

 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
 * Similarly, the png_get_<chunk> calls are used to read values from the
@@ -2215,6 +2225,10 @@ extern PNG_EXPORT(void, png_set_unknown_chunk_location)
 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
   png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
 #endif
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
+   chunk_name));
+#endif

 /* Png_free_data() will turn off the "valid" flag for anything it frees.
   If you need to turn it off for a chunk that your application has freed,
@@ -2326,6 +2340,7 @@ extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
 #define PNG_SELECT_WRITE  2


+#if !defined(PNG_1_0_X)
 /* pngget.c */
 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
   PNGARG((int flag_select, int *compilerID));
@@ -2355,8 +2370,10 @@ extern PNG_EXPORT(void,png_set_mmx_thresholds)
   PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
   png_uint_32 mmx_rowbytes_threshold));

+#endif /* PNG_1_0_X */
 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */

+#if !defined(PNG_1_0_X)
 /* png.c, pnggccrd.c, or pngvcrd.c */
 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));

@@ -2366,11 +2383,12 @@ extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
   png_ptr, png_uint_32 strip_mode));
 #endif
+#endif /* PNG_1_0_X */

 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */

 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.1beta4 - November 7, 2001 (header)\n"
+   " libpng version 1.2.3rc6 - May 13, 2002 (header)\n"

 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
 /* With these routines we avoid an integer divide, which will be slower on
@@ -2495,6 +2513,7 @@ extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
 #define PNG_FLAG_LIBRARY_MISMATCH         0x20000L
 #define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
 #define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
+#define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L

 /* For use in png_set_keep_unknown, png_handle_as_unknown */
 #define HANDLE_CHUNK_AS_DEFAULT   0
@@ -2644,6 +2663,26 @@ PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
 /* Function to free memory for zlib */
 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));

+/* Next four functions are used internally as callbacks.  PNGAPI is required
+ * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */
+
+PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
+   png_bytep data, png_size_t length));
+
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
+   png_bytep buffer, png_size_t length));
+#endif
+
+PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
+   png_bytep data, png_size_t length));
+
+#if defined(PNG_WRITE_FLUSH_SUPPORTED)
+#if !defined(PNG_NO_STDIO)
+PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
+#endif
+#endif
+
 /* Reset the CRC variable */
 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));

@@ -2684,6 +2723,7 @@ PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
 #endif

+
 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
 * The only currently known PNG chunks that use signed numbers are
 * the ancillary extension chunks, oFFs and pCAL.
@@ -3106,11 +3146,6 @@ PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
 #endif

-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-PNG_EXTERN int png_handle_as_unknown PNGARG((png_structp png_ptr, png_bytep
-   chunk_name));
-#endif
-
 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_uint_32 length));

@@ -3132,8 +3167,6 @@ PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
   png_uint_32 length));
 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
-   png_bytep buffer, png_size_t length));
 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
   png_bytep buffer, png_size_t buffer_length));
--- a/pngasmrd.h
+++ b/pngasmrd.h
@@ -1,8 +1,8 @@
 /* pngasmrd.h - assembler version of utilities to read a PNG file
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 2001 Glenn Randers-Pehrson
+ * Copyright (c) 2002 Glenn Randers-Pehrson
 *
 */

--- a/pngconf.h
+++ b/pngconf.h
@@ -1,8 +1,8 @@
 /* pngconf.h - machine configurable file for libpng
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 */
@@ -47,7 +47,7 @@

 /* Enabled by default in 1.2.0.  You can disable this if you don't need to
   support PNGs that are embedded in MNG datastreams */
-#ifndef PNG_NO_MNG_FEATURES
+#if !defined(PNG_1_0_X) && !defined(PNG_NO_MNG_FEATURES)
 #  ifndef PNG_MNG_FEATURES_SUPPORTED
 #    define PNG_MNG_FEATURES_SUPPORTED
 #  endif
@@ -78,12 +78,12 @@
 *   (no define)   -- building static library, or building an
 *                    application and linking to the static lib
 * 'Cygwin' defines/defaults:
- *   PNG_BUILD_DLL -- building the dll
- *   (no define)   -- building an application, linking to the dll
- *   PNG_STATIC    -- building the static lib, or building an application
- *                    that links to the static lib.
- *   ALL_STATIC    -- building various static libs, or building an application
- *                    that links to the static libs.
+ *   PNG_BUILD_DLL -- (ignored) building the dll
+ *   (no define)   -- (ignored) building an application, linking to the dll
+ *   PNG_STATIC    -- (ignored) building the static lib, or building an 
+ *                    application that links to the static lib.
+ *   ALL_STATIC    -- (ignored) building various static libs, or building an 
+ *                    application that links to the static libs.
 * Thus,
 * a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and
 * this bit of #ifdefs will define the 'correct' config variables based on
@@ -94,7 +94,15 @@
 *   ALL_STATIC (since we can't #undef something outside our namespace)
 *   PNG_BUILD_DLL
 *   PNG_STATIC
- *   (nothing) == PNG_USE_DLL 
+ *   (nothing) == PNG_USE_DLL
+ * 
+ * CYGWIN (2002-01-20): The preceding is now obsolete. With the advent
+ *   of auto-import in binutils, we no longer need to worry about 
+ *   __declspec(dllexport) / __declspec(dllimport) and friends.  Therefore,
+ *   we don't need to worry about PNG_STATIC or ALL_STATIC when it comes
+ *   to __declspec() stuff.  However, we DO need to worry about 
+ *   PNG_BUILD_DLL and PNG_STATIC because those change some defaults
+ *   such as CONSOLE_IO and whether GLOBAL_ARRAYS are allowed.
 */
 #if defined(__CYGWIN__)
 #  if defined(ALL_STATIC)
@@ -591,9 +599,11 @@
 #  define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
 #endif

+#ifndef PNG_1_0_X
 #ifndef PNG_NO_ERROR_NUMBERS
 #define PNG_ERROR_NUMBERS_SUPPORTED
 #endif
+#endif /* PNG_1_0_X */

 #ifndef PNG_NO_WRITE_FLUSH
 #  define PNG_WRITE_FLUSH_SUPPORTED
@@ -647,9 +657,11 @@
 #define PNG_THREAD_UNSAFE_OK
 */

+#if !defined(PNG_1_0_X)
 #if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED)
 #  define PNG_USER_MEM_SUPPORTED
 #endif
+#endif /* PNG_1_0_X */

 /* These are currently experimental features, define them if you want */

@@ -1145,10 +1157,23 @@ typedef z_stream FAR *  png_zstreamp;
 #  endif
 #endif

+#if defined(__CYGWIN__)
+#  undef PNGAPI
+#  define PNGAPI __cdecl
+#  undef PNG_IMPEXP
+#  define PNG_IMPEXP
+#endif  
+
+/* If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall",
+ * you may get warnings regarding the linkage of png_zalloc and png_zfree.
+ * Don't ignore those warnings; you must also reset the default calling
+ * convention in your compiler to match your PNGAPI, and you must build
+ * zlib and your applications the same way you build libpng.
+ */

 #ifndef PNGAPI

-#if defined(__MINGW32__) || defined(__CYGWIN__) && !defined(PNG_MODULEDEF)
+#if defined(__MINGW32__) && !defined(PNG_MODULEDEF)
 #  ifndef PNG_NO_MODULEDEF
 #    define PNG_NO_MODULEDEF
 #  endif
@@ -1161,7 +1186,7 @@ typedef z_stream FAR *  png_zstreamp;
 #if defined(PNG_DLL) || defined(_DLL) || defined(__DLL__ ) || \
    (( defined(_Windows) || defined(_WINDOWS) || \
       defined(WIN32) || defined(_WIN32) || defined(__WIN32__) \
-	  ) && !defined(__CYGWIN__))
+	  ))

 #  if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
 #    define PNGAPI __cdecl
@@ -1204,12 +1229,6 @@ typedef z_stream FAR *  png_zstreamp;
 #     endif
 #  endif  /* PNG_IMPEXP */
 #else /* !(DLL || non-cygwin WINDOWS) */
-#  if defined(__CYGWIN__) && !defined(PNG_DLL)
-#    if !defined(PNG_IMPEXP)
-#      define PNG_IMPEXP
-#    endif
-#    define PNGAPI __cdecl
-#  else
 #    if (defined(__IBMC__) || defined(IBMCPP__)) && defined(__OS2__)
 #      define PNGAPI _System
 #      define PNG_IMPEXP
@@ -1220,7 +1239,6 @@ typedef z_stream FAR *  png_zstreamp;
 #        define PNG_IMPEXP
 #      endif
 #    endif
-#  endif
 #endif
 #endif

--- a/pngerror.c
+++ b/pngerror.c
@@ -1,9 +1,9 @@

 /* pngerror.c - stub functions for i/o and memory allocation
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -18,10 +18,10 @@

 static void /* PRIVATE */
 png_default_error PNGARG((png_structp png_ptr,
-                                      png_const_charp message));
+  png_const_charp error_message));
 static void /* PRIVATE */
 png_default_warning PNGARG((png_structp png_ptr,
-                                        png_const_charp message));
+  png_const_charp warning_message));

 /* This function is called whenever there is a fatal error.  This function
 * should not be changed.  If there is a need to handle errors differently,
@@ -29,28 +29,28 @@ png_default_warning PNGARG((png_structp png_ptr,
 * to replace the error function at run-time.
 */
 void PNGAPI
-png_error(png_structp png_ptr, png_const_charp message)
+png_error(png_structp png_ptr, png_const_charp error_message)
 {
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
   char msg[16];
   if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
   {
     int offset = 0;
-     if (*message == '#')
+     if (*error_message == '#')
     {
         for (offset=1; offset<15; offset++)
-            if (*(message+offset) == ' ')
+            if (*(error_message+offset) == ' ')
                break;
         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
         {
            int i;
            for (i=0; i<offset-1; i++)
-               msg[i]=message[i+1];
+               msg[i]=error_message[i+1];
            msg[i]='\0';
-            message=msg;
+            error_message=msg;
         }
         else
-            message+=offset;
+            error_message+=offset;
     }
     else
     {
@@ -58,17 +58,17 @@ png_error(png_structp png_ptr, png_const_charp message)
         {
            msg[0]='0';        
            msg[1]='\0';
-            message=msg;
+            error_message=msg;
         }
     }
   }
 #endif
   if (png_ptr->error_fn != NULL)
-      (*(png_ptr->error_fn))(png_ptr, message);
+      (*(png_ptr->error_fn))(png_ptr, error_message);

   /* if the following returns or doesn't exist, use the default function,
      which will not return */
-   png_default_error(png_ptr, message);
+   png_default_error(png_ptr, error_message);
 }

 /* This function is called whenever there is a non-fatal error.  This function
@@ -77,27 +77,28 @@ png_error(png_structp png_ptr, png_const_charp message)
 * png_set_error_fn() to replace the warning function at run-time.
 */
 void PNGAPI
-png_warning(png_structp png_ptr, png_const_charp message)
+png_warning(png_structp png_ptr, png_const_charp warning_message)
 {
     int offset = 0;
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
   if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
 #endif
   {
-     if (*message == '#')
+     if (*warning_message == '#')
     {
         for (offset=1; offset<15; offset++)
-            if (*(message+offset) == ' ')
+            if (*(warning_message+offset) == ' ')
                break;
     }
   }
   if (png_ptr->warning_fn != NULL)
-      (*(png_ptr->warning_fn))(png_ptr, (png_const_charp)(message+offset));
+      (*(png_ptr->warning_fn))(png_ptr, (png_const_charp)
+        (warning_message+offset));
   else
-      png_default_warning(png_ptr, (png_const_charp)(message+offset));
+      png_default_warning(png_ptr, (png_const_charp)(warning_message+offset));
 }

-/* These utilities are used internally to build an error message that relates
+/* These utilities are used internally to build a warning message that relates
 * to the current chunk.  The chunk name comes from png_ptr->chunk_name,
 * this is used to prefix the message.  The message is limited in length
 * to 63 bytes, the name characters are output as hex digits wrapped in []
@@ -110,7 +111,7 @@ static PNG_CONST char png_digit[16] = {

 static void /* PRIVATE */
 png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
-   message)
+   error_message)
 {
   int iout = 0, iin = 0;

@@ -130,30 +131,30 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
      }
   }

-   if (message == NULL)
+   if (error_message == NULL)
      buffer[iout] = 0;
   else
   {
      buffer[iout++] = ':';
      buffer[iout++] = ' ';
-      png_memcpy(buffer+iout, message, 64);
+      png_memcpy(buffer+iout, error_message, 64);
      buffer[iout+63] = 0;
   }
 }

 void PNGAPI
-png_chunk_error(png_structp png_ptr, png_const_charp message)
+png_chunk_error(png_structp png_ptr, png_const_charp error_message)
 {
   char msg[18+64];
-   png_format_buffer(png_ptr, msg, message);
+   png_format_buffer(png_ptr, msg, error_message);
   png_error(png_ptr, msg);
 }

 void PNGAPI
-png_chunk_warning(png_structp png_ptr, png_const_charp message)
+png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
 {
   char msg[18+64];
-   png_format_buffer(png_ptr, msg, message);
+   png_format_buffer(png_ptr, msg, warning_message);
   png_warning(png_ptr, msg);
 }

@@ -163,33 +164,34 @@ png_chunk_warning(png_structp png_ptr, png_const_charp message)
 * error function pointer in png_set_error_fn().
 */
 static void /* PRIVATE */
-png_default_error(png_structp png_ptr, png_const_charp message)
+png_default_error(png_structp png_ptr, png_const_charp error_message)
 {
 #ifndef PNG_NO_CONSOLE_IO
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-   if (*message == '#')
+   if (*error_message == '#')
   {
     int offset;
     char error_number[16];
     for (offset=0; offset<15; offset++)
     {
-         error_number[offset] = *(message+offset+1);
-         if (*(message+offset) == ' ')
+         error_number[offset] = *(error_message+offset+1);
+         if (*(error_message+offset) == ' ')
             break;
     }
     if((offset > 1) && (offset < 15))
     {
       error_number[offset-1]='\0';
-       fprintf(stderr, "libpng error no. %s: %s\n", error_number, message+offset);
+       fprintf(stderr, "libpng error no. %s: %s\n", error_number,
+          error_message+offset);
     }
     else
-       fprintf(stderr, "libpng error: %s, offset=%d\n", message,offset);
+       fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
   }
   else
 #endif
-   fprintf(stderr, "libpng error: %s\n", message);
+   fprintf(stderr, "libpng error: %s\n", error_message);
 #else
-   if (message)
+   if (error_message)
     /* make compiler happy */ ;
 #endif

@@ -216,34 +218,34 @@ png_default_error(png_structp png_ptr, png_const_charp message)
 * not used, but it is passed in case it may be useful.
 */
 static void /* PRIVATE */
-png_default_warning(png_structp png_ptr, png_const_charp message)
+png_default_warning(png_structp png_ptr, png_const_charp warning_message)
 {
 #ifndef PNG_NO_CONSOLE_IO
 #  ifdef PNG_ERROR_NUMBERS_SUPPORTED
-   if (*message == '#')
+   if (*warning_message == '#')
   {
     int offset;
     char warning_number[16];
     for (offset=0; offset<15; offset++)
     {
-        warning_number[offset]=*(message+offset+1);
-        if (*(message+offset) == ' ')
+        warning_number[offset]=*(warning_message+offset+1);
+        if (*(warning_message+offset) == ' ')
            break;
     }
     if((offset > 1) && (offset < 15))
     {
       warning_number[offset-1]='\0';
       fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
-          message+offset);
+          warning_message+offset);
     }
     else
-       fprintf(stderr, "libpng warning: %s\n", message);
+       fprintf(stderr, "libpng warning: %s\n", warning_message);
   }
   else
 #  endif
-     fprintf(stderr, "libpng warning: %s\n", message);
+     fprintf(stderr, "libpng warning: %s\n", warning_message);
 #else
-   if (message)
+   if (warning_message)
     /* appease compiler */ ;
 #endif
   if (png_ptr)
@@ -277,7 +279,7 @@ png_get_error_ptr(png_structp png_ptr)


 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-void
+void PNGAPI
 png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
 {
   if(png_ptr != NULL)
--- a/pnggccrd.c
+++ b/pnggccrd.c
@@ -6,9 +6,9 @@
 *     and http://www.intel.com/drg/pentiumII/appnotes/923/923.htm
 *     for Intel's performance analysis of the MMX vs. non-MMX code.
 *
- * libpng version 1.2.1beta4 - November 7, 2001
+ * libpng version 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * Copyright (c) 1998, Intel Corporation
 *
 * Based on MSVC code contributed by Nirav Chhatrapati, Intel Corp., 1998.
@@ -220,6 +220,9 @@
 * 20010310:
 *  - fixed buffer-overrun bug in png_combine_row() C code (non-MMX)
 *
+ * 20020304:
+ *  - eliminated incorrect use of width_mmx in pixel_bytes == 8 case
+ *
 * STILL TO DO:
 *     - test png_do_read_interlace() 64-bit case (pixel_bytes == 8)
 *     - write MMX code for 48-bit case (pixel_bytes == 6)
@@ -597,8 +600,12 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
            png_bytep dstptr;

 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                /* && _mmx_supported */ )
+#else
+            if (_mmx_supported)
+#endif
            {
               png_uint_32 len;
               int diff;
@@ -731,8 +738,12 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
            png_bytep dstptr;

 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                /* && _mmx_supported */ )
+#else
+            if (_mmx_supported)
+#endif
            {
               png_uint_32 len;
               int diff;
@@ -880,8 +891,12 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
            png_bytep dstptr;

 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                /* && _mmx_supported */ )
+#else
+            if (_mmx_supported)
+#endif
            {
               png_uint_32 len;
               int diff;
@@ -1044,8 +1059,12 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
            png_bytep dstptr;

 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                /* && _mmx_supported */ )
+#else
+            if (_mmx_supported)
+#endif
            {
               png_uint_32 len;
               int diff;
@@ -1215,8 +1234,12 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
            png_bytep dstptr;

 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                /* && _mmx_supported */ )
+#else
+            if (_mmx_supported)
+#endif
            {
               png_uint_32 len;
               int diff;
@@ -1691,8 +1714,12 @@ png_do_read_interlace(png_structp png_ptr)
            /* New code by Nirav Chhatrapati - Intel Corporation */

 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+#if !defined(PNG_1_0_X)
            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_INTERLACE)
                /* && _mmx_supported */ )
+#else
+            if (_mmx_supported)
+#endif
            {
               //--------------------------------------------------------------
               if (pixel_bytes == 3)
@@ -2464,9 +2491,8 @@ png_do_read_interlace(png_structp png_ptr)
                  {
                     // source is 8-byte RRGGBBAA
                     // dest is 32-byte RRGGBBAA RRGGBBAA RRGGBBAA RRGGBBAA
-                     int width_mmx = ((width >> 1) << 1) ;
-                     width -= width_mmx;
-                     if (width_mmx)
+                     // (recall that expansion is _in place_:  sptr and dp
+                     //  both point at locations within same row buffer)
                     {
                        int dummy_value_c;  // fix 'forbidden register spilled'
                        int dummy_value_S;
@@ -2505,9 +2531,6 @@ png_do_read_interlace(png_structp png_ptr)
                  {
                     // source is 8-byte RRGGBBAA
                     // dest is 16-byte RRGGBBAA RRGGBBAA
-                     int width_mmx = ((width >> 1) << 1) ;
-                     width -= width_mmx;
-                     if (width_mmx)
                     {
                        int dummy_value_c;  // fix 'forbidden register spilled'
                        int dummy_value_S;
@@ -4895,6 +4918,9 @@ png_read_filter_row_mmx_up(png_row_infop row_info, png_bytep row,
   __asm__ __volatile__ (
 //pre "movl row, %%edi              \n\t"
      // get # of bytes to alignment
+#ifdef __PIC__
+      "pushl %%ebx                  \n\t"
+#endif
      "movl %%edi, %%ecx            \n\t"
      "xorl %%ebx, %%ebx            \n\t"
      "addl $0x7, %%ecx             \n\t"
@@ -4994,6 +5020,9 @@ png_read_filter_row_mmx_up(png_row_infop row_info, png_bytep row,

   "up_end:                         \n\t"
      "EMMS                         \n\t" // conversion of filtered row complete
+#ifdef __PIC__
+      "popl %%ebx                   \n\t"
+#endif

      : "=d" (dummy_value_d),   // 0      // output regs (dummy)
        "=S" (dummy_value_S),   // 1
@@ -5057,26 +5086,34 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
         break;
      case 1: sprintf(filnm, "sub-%s",
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
        (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB)? "MMX" : 
 #endif
+#endif
 "x86");
         break;
      case 2: sprintf(filnm, "up-%s",
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+#if !defined(PNG_1_0_X)
        (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_UP)? "MMX" :
+#endif
 #endif
 "x86");
         break;
      case 3: sprintf(filnm, "avg-%s",
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
        (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_AVG)? "MMX" :
+#endif
 #endif
 "x86");
         break;
      case 4: sprintf(filnm, "Paeth-%s",
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
        (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH)? "MMX":
 #endif
+#endif
 "x86");
         break;
      default: sprintf(filnm, "unknw");
@@ -5096,7 +5133,11 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep

      case PNG_FILTER_VALUE_SUB:
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
         if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB) &&
+#else
+         if (
+#endif
             (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
             (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
         {
@@ -5121,7 +5162,11 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep

      case PNG_FILTER_VALUE_UP:
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+#if !defined(PNG_1_0_X)
         if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_UP) &&
+#else
+         if (
+#endif
             (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
             (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
         {
@@ -5145,7 +5190,11 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep

      case PNG_FILTER_VALUE_AVG:
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
         if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_AVG) &&
+#else
+         if (
+#endif
             (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
             (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
         {
@@ -5179,7 +5228,11 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep

      case PNG_FILTER_VALUE_PAETH:
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_THREAD_UNSAFE_OK)
+#if !defined(PNG_1_0_X)
         if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH) &&
+#else
+         if (
+#endif
             (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
             (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
         {
@@ -5287,6 +5340,8 @@ png_mmx_support(void)
        "popfl                \n\t"  // restore modified value to Eflag reg
        "pushfl               \n\t"  // save Eflag to stack
        "popl %%eax           \n\t"  // get Eflag from stack
+        "pushl %%ecx          \n\t"  // save original Eflag to stack
+        "popfl                \n\t"  // restore original Eflag
        "xorl %%ecx, %%eax    \n\t"  // compare new Eflag with original Eflag
        "jz .NOT_SUPPORTED    \n\t"  // if same, CPUID instr. is not supported

--- a/pngget.c
+++ b/pngget.c
@@ -1,9 +1,9 @@

 /* pngget.c - retrieval of values from info struct
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 */
@@ -547,7 +547,11 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
      *width = info_ptr->width;
      *height = info_ptr->height;
      *bit_depth = info_ptr->bit_depth;
+      if (info_ptr->bit_depth < 1 || info_ptr->bit_depth > 16)
+        png_error(png_ptr, "Invalid bit depth");
      *color_type = info_ptr->color_type;
+      if (info_ptr->color_type > 6)
+        png_error(png_ptr, "Invalid color type");
      if (compression_type != NULL)
         *compression_type = info_ptr->compression_type;
      if (filter_type != NULL)
@@ -566,6 +570,10 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
         channels++;
      pixel_depth = *bit_depth * channels;
      rowbytes_per_pixel = (pixel_depth + 7) >> 3;
+      if (width == 0 || *width > PNG_MAX_UINT)
+        png_error(png_ptr, "Invalid image width");
+      if (height == 0 || *height > PNG_MAX_UINT)
+        png_error(png_ptr, "Invalid image height");
      if ((*width > PNG_MAX_UINT/rowbytes_per_pixel))
      {
         png_warning(png_ptr,
@@ -827,6 +835,7 @@ png_get_compression_buffer_size(png_structp png_ptr)
 }


+#ifndef PNG_1_0_X
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
 /* this function was added to libpng 1.2.0 and should exist by default*/
 png_uint_32 PNGAPI
@@ -915,3 +924,4 @@ png_get_mmx_rowbytes_threshold (png_structp png_ptr)
    return (png_uint_32)(png_ptr? png_ptr->mmx_rowbytes_threshold : 0L);
 }
 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
+#endif /* PNG_1_0_X */
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,9 +1,9 @@

 /* pngmem.c - stub functions for memory allocation
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -43,7 +43,7 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
   else if (type == PNG_STRUCT_PNG)
     size = sizeof(png_struct);
   else
-     return (NULL);
+     return (png_get_copyright());

 #ifdef PNG_USER_MEM_SUPPORTED
   if(malloc_fn != NULL)
@@ -122,8 +122,8 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
 #ifdef PNG_USER_MEM_SUPPORTED
   if(png_ptr->malloc_fn != NULL)
   {
-       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
-       if (ret == NULL)
+       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+       if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
          png_error(png_ptr, "Out of memory!");
       return (ret);
   }
@@ -177,12 +177,22 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)

            if (table == NULL)
            {
-               png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
+               if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
+               else
+                  png_warning(png_ptr, "Out Of Memory.");
+               return (NULL);
            }

            if ((png_size_t)table & 0xfff0)
            {
-               png_error(png_ptr, "Farmalloc didn't return normalized pointer");
+               if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr,
+                    "Farmalloc didn't return normalized pointer");
+               else
+                  png_warning(png_ptr,
+                    "Farmalloc didn't return normalized pointer");
+               return (NULL);
            }

            png_ptr->offset_table = table;
@@ -191,7 +201,11 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)

            if (png_ptr->offset_table_ptr == NULL)
            {
-               png_error(png_ptr, "Out Of memory.");
+               if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
+               else
+                  png_warning(png_ptr, "Out Of memory.");
+               return (NULL);
            }

            hptr = (png_byte huge *)table;
@@ -213,7 +227,13 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
      }

      if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
-         png_error(png_ptr, "Out of Memory.");
+      {
+         if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+            png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
+         else
+            png_warning(png_ptr, "Out of Memory.");
+         return (NULL);
+      }

      ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
   }
@@ -222,7 +242,10 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)

   if (ret == NULL)
   {
-      png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
+      if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+         png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
+      else
+         png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
   }

   return (ret);
@@ -314,7 +337,7 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
      png_struct dummy_struct;
      png_structp png_ptr = &dummy_struct;
      png_ptr->mem_ptr=mem_ptr;
-      struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
+      struct_ptr = (*(malloc_fn))(png_ptr, size);
      if (struct_ptr != NULL)
         png_memset(struct_ptr, 0, size);
      return (struct_ptr);
@@ -394,14 +417,14 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
   if(png_ptr->malloc_fn != NULL)
   {
       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
-       if (ret == NULL)
+       if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
          png_error(png_ptr, "Out of Memory!");
       return (ret);
   }
   else
       return (png_malloc_default(png_ptr, size));
 }
-png_voidp /* PRIVATE */
+png_voidp PNGAPI
 png_malloc_default(png_structp png_ptr, png_uint_32 size)
 {
   png_voidp ret;
@@ -409,7 +432,12 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)

 #ifdef PNG_MAX_MALLOC_64K
   if (size > (png_uint_32)65536L)
-      png_error(png_ptr, "Cannot Allocate > 64K");
+   {
+      if(png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+         png_error(png_ptr, "Cannot Allocate > 64K");
+      else
+         return NULL;
+   }
 #endif

 #if defined(__TURBOC__) && !defined(__FLAT__)
@@ -422,7 +450,7 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
 # endif
 #endif

-   if (ret == NULL)
+   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
      png_error(png_ptr, "Out of Memory");

   return (ret);
@@ -444,7 +472,7 @@ png_free(png_structp png_ptr, png_voidp ptr)
   }
   else png_free_default(png_ptr, ptr);
 }
-void /* PRIVATE */
+void PNGAPI
 png_free_default(png_structp png_ptr, png_voidp ptr)
 {
   if (png_ptr == NULL || ptr == NULL)
@@ -465,7 +493,7 @@ png_free_default(png_structp png_ptr, png_voidp ptr)

 #endif /* Not Borland DOS special memory handler */

-png_voidp /* PRIVATE */
+png_voidp PNGAPI
 png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
   png_uint_32 length)
 {
@@ -478,7 +506,7 @@ png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
   return(png_memcpy (s1, s2, size));
 }

-png_voidp /* PRIVATE */
+png_voidp PNGAPI
 png_memset_check (png_structp png_ptr, png_voidp s1, int value,
   png_uint_32 length)
 {
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,9 +1,9 @@

 /* pngpread.c - read a png file in push mode
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 */
@@ -240,6 +240,12 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
       * header chunks, and we can start reading the image (or if this
       * is called after the image has been read - we have an error).
       */
+     if (!(png_ptr->mode & PNG_HAVE_IHDR))
+       png_error(png_ptr, "Missing IHDR before IDAT");
+     else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+	      !(png_ptr->mode & PNG_HAVE_PLTE))
+       png_error(png_ptr, "Missing PLTE before IDAT");
+
      if (png_ptr->mode & PNG_HAVE_IDAT)
      {
         if (png_ptr->push_length == 0)
@@ -518,7 +524,7 @@ png_push_crc_finish(png_structp png_ptr)
   }
 }

-void /* PRIVATE */
+void PNGAPI
 png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
 {
   png_bytep ptr;
--- a/pngread.c
+++ b/pngread.c
@@ -1,9 +1,9 @@

 /* pngread.c - read a PNG file
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -45,16 +45,19 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,

   png_debug(1, "in png_create_read_struct\n");
 #ifdef PNG_USER_MEM_SUPPORTED
-   if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
-      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr)) == NULL)
+   png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
+      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
 #else
-   if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
+   png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
 #endif
+   if (png_ptr == NULL)
      return (NULL);

+#if !defined(PNG_1_0_X)
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
 #endif
+#endif /* PNG_1_0_X */

 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
@@ -65,7 +68,13 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
   {
      png_free(png_ptr, png_ptr->zbuf);
      png_ptr->zbuf=NULL;
-      png_destroy_struct(png_ptr);
+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)png_ptr, 
+			   (png_free_ptr)free_fn,
+			   (png_voidp)mem_ptr);
+#else
+      png_destroy_struct((png_voidp)png_ptr);
+#endif
      return (NULL);
   }
 #ifdef USE_FAR_KEYWORD
@@ -139,6 +148,19 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,

   png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);

+#ifdef PNG_SETJMP_SUPPORTED
+/* Applications that neglect to set up their own setjmp() and then encounter
+   a png_error() will longjmp here.  Since the jmpbuf is then meaningless we
+   abort instead of returning. */
+#ifdef USE_FAR_KEYWORD
+   if (setjmp(jmpbuf))
+      PNG_ABORT();
+   png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+#else
+   if (setjmp(png_ptr->jmpbuf))
+      PNG_ABORT();
+#endif
+#endif
   return (png_ptr);
 }

@@ -373,6 +395,9 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
      png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name,
         length);

+      if (length > PNG_MAX_UINT)
+         png_error(png_ptr, "Invalid chunk length.");
+
      /* This should be a binary subdivision search or a hash for
       * matching the chunk name rather than a linear search.
       */
@@ -656,6 +681,9 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
            png_read_data(png_ptr, chunk_length, 4);
            png_ptr->idat_size = png_get_uint_32(chunk_length);

+            if (png_ptr->idat_size > PNG_MAX_UINT)
+              png_error(png_ptr, "Invalid chunk length.");
+
            png_reset_crc(png_ptr);
            png_crc_read(png_ptr, png_ptr->chunk_name, 4);
            if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
@@ -767,7 +795,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
 * not called png_set_interlace_handling(), the display_row buffer will
 * be ignored, so pass NULL to it.
 *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.1beta4
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.3rc6
 */

 void PNGAPI
@@ -816,7 +844,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
 * only call this function once.  If you desire to have an image for
 * each pass of a interlaced image, use png_read_rows() instead.
 *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.1beta4
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.3rc6
 */
 void PNGAPI
 png_read_image(png_structp png_ptr, png_bytepp image)
@@ -934,6 +962,9 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)

      png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name);

+      if (length > PNG_MAX_UINT)
+         png_error(png_ptr, "Invalid chunk length.");
+
      if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
         png_handle_IHDR(png_ptr, info_ptr, length);
      else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
--- a/pngrio.c
+++ b/pngrio.c
@@ -1,9 +1,9 @@

 /* pngrio.c - functions for data input
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -39,7 +39,7 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
   read_data function and use it at run time with png_set_read_fn(), rather
   than changing the library. */
 #ifndef USE_FAR_KEYWORD
-static void /* PRIVATE */
+void PNGAPI
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
   png_size_t check;
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,9 +1,9 @@

 /* pngrtran.c - transforms the data in a row for PNG readers
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -510,13 +510,19 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
 * only do transformations on images where the file_gamma and screen_gamma
 * are not close reciprocals, otherwise it slows things down slightly, and
 * also needlessly introduces small errors.
+ *
+ * We will turn off gamma transformation later if no semitransparent entries
+ * are present in the tRNS array for palette images.  We can't do it here
+ * because we don't necessarily have the tRNS chunk yet.
 */
 void PNGAPI
 png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma)
 {
   png_debug(1, "in png_set_gamma\n");
-   if (fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD)
-      png_ptr->transformations |= PNG_GAMMA;
+   if ((fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD) ||
+       (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) ||
+       (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE))
+     png_ptr->transformations |= PNG_GAMMA;
   png_ptr->gamma = (float)file_gamma;
   png_ptr->screen_gamma = (float)scrn_gamma;
 }
@@ -692,23 +698,23 @@ png_init_read_transformations(png_structp png_ptr)
         {
            case 1:
               png_ptr->background.gray *= (png_uint_16)0xff;
-               png_ptr->background.red = png_ptr->background.green =
-               png_ptr->background.blue = png_ptr->background.gray;
+               png_ptr->background.red = png_ptr->background.green
+                 =  png_ptr->background.blue = png_ptr->background.gray;
               break;
            case 2:
               png_ptr->background.gray *= (png_uint_16)0x55;
-               png_ptr->background.red = png_ptr->background.green =
-               png_ptr->background.blue = png_ptr->background.gray;
+               png_ptr->background.red = png_ptr->background.green
+                 = png_ptr->background.blue = png_ptr->background.gray;
               break;
            case 4:
               png_ptr->background.gray *= (png_uint_16)0x11;
-               png_ptr->background.red = png_ptr->background.green =
-               png_ptr->background.blue = png_ptr->background.gray;
+               png_ptr->background.red = png_ptr->background.green
+                 = png_ptr->background.blue = png_ptr->background.gray;
               break;
            case 8:
            case 16:
-               png_ptr->background.red = png_ptr->background.green =
-               png_ptr->background.blue = png_ptr->background.gray;
+               png_ptr->background.red = png_ptr->background.green
+                 = png_ptr->background.blue = png_ptr->background.gray;
               break;
         }
      }
@@ -746,6 +752,22 @@ png_init_read_transformations(png_structp png_ptr)
   png_ptr->background_1 = png_ptr->background;
 #endif
 #if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
+
+   if ((color_type == PNG_COLOR_TYPE_PALETTE && png_ptr->num_trans != 0)
+       && (fabs(png_ptr->screen_gamma * png_ptr->gamma - 1.0)
+         < PNG_GAMMA_THRESHOLD))
+   {
+    int i,k;
+    k=0;
+    for (i=0; i<png_ptr->num_trans; i++)
+    {
+      if (png_ptr->trans[i] != 0 && png_ptr->trans[i] != 0xff)
+        k=1; /* partial transparency is present */
+    }
+    if (k == 0)
+      png_ptr->transformations &= (~PNG_GAMMA);
+   }
+
   if (png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY))
   {
      png_build_gamma_table(png_ptr);
@@ -754,6 +776,8 @@ png_init_read_transformations(png_structp png_ptr)
      {
         if (color_type == PNG_COLOR_TYPE_PALETTE)
         {
+           /* could skip if no transparency and 
+           */
            png_color back, back_1;
            png_colorp palette = png_ptr->palette;
            int num_palette = png_ptr->num_palette;
@@ -873,9 +897,16 @@ png_init_read_transformations(png_structp png_ptr)
                  break;
            }

-            if (color_type & PNG_COLOR_MASK_COLOR)
+            png_ptr->background_1.gray = (png_uint_16)(pow(
+               (double)png_ptr->background.gray / m, g) * m + .5);
+            png_ptr->background.gray = (png_uint_16)(pow(
+               (double)png_ptr->background.gray / m, gs) * m + .5);
+
+            if ((png_ptr->background.red != png_ptr->background.green) ||
+                (png_ptr->background.red != png_ptr->background.blue) ||
+                (png_ptr->background.red != png_ptr->background.gray))
            {
-               /* RGB or RGBA */
+               /* RGB or RGBA with color background */
               png_ptr->background_1.red = (png_uint_16)(pow(
                  (double)png_ptr->background.red / m, g) * m + .5);
               png_ptr->background_1.green = (png_uint_16)(pow(
@@ -891,11 +922,11 @@ png_init_read_transformations(png_structp png_ptr)
            }
            else
            {
-               /* GRAY or GRAY ALPHA */
-               png_ptr->background_1.gray = (png_uint_16)(pow(
-                  (double)png_ptr->background.gray / m, g) * m + .5);
-               png_ptr->background.gray = (png_uint_16)(pow(
-                  (double)png_ptr->background.gray / m, gs) * m + .5);
+               /* GRAY, GRAY ALPHA, RGB, or RGBA with gray background */
+               png_ptr->background_1.red = png_ptr->background_1.green
+                 = png_ptr->background_1.blue = png_ptr->background_1.gray;
+               png_ptr->background.red = png_ptr->background.green
+                 = png_ptr->background.blue = png_ptr->background.gray;
            }
         }
      }
@@ -2315,7 +2346,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
 * paletted.  Most useful for gamma correction and simplification
 * of code.
 */
-void /* PRIVATE */
+void PNGAPI
 png_build_grayscale_palette(int bit_depth, png_colorp palette)
 {
   int num_palette;
@@ -3150,17 +3181,17 @@ png_do_background(png_row_infop row_info, png_bytep row,
                        png_uint_16 v, w, x;

                        v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
-                        png_composite_16(w, v, a, background->red);
+                        png_composite_16(w, v, a, background_1->red);
                        x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
                        *dp = (png_byte)((x >> 8) & 0xff);
                        *(dp + 1) = (png_byte)(x & 0xff);
                        v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)];
-                        png_composite_16(w, v, a, background->green);
+                        png_composite_16(w, v, a, background_1->green);
                        x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
                        *(dp + 2) = (png_byte)((x >> 8) & 0xff);
                        *(dp + 3) = (png_byte)(x & 0xff);
                        v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)];
-                        png_composite_16(w, v, a, background->blue);
+                        png_composite_16(w, v, a, background_1->blue);
                        x = gamma_16_from_1[(w & 0xff) >> gamma_shift][w >> 8];
                        *(dp + 4) = (png_byte)((x >> 8) & 0xff);
                        *(dp + 5) = (png_byte)(x & 0xff);
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,9 +1,9 @@

 /* pngrutil.c - utilities to read a PNG file
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -691,6 +691,8 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
   png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
      int_y_green, int_x_blue, int_y_blue;

+   png_uint_32 uint_x, uint_y;
+
   png_debug(1, "in png_handle_cHRM\n");

   if (!(png_ptr->mode & PNG_HAVE_IHDR))
@@ -724,60 +726,69 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
   }

   png_crc_read(png_ptr, buf, 4);
-   int_x_white = (png_fixed_point)png_get_uint_32(buf);
+   uint_x = png_get_uint_32(buf);

   png_crc_read(png_ptr, buf, 4);
-   int_y_white = (png_fixed_point)png_get_uint_32(buf);
+   uint_y = png_get_uint_32(buf);

-   if (int_x_white > 80000L || int_y_white > 80000L ||
-      int_x_white + int_y_white > 100000L)
+   if (uint_x > 80000L || uint_y > 80000L ||
+      uint_x + uint_y > 100000L)
   {
      png_warning(png_ptr, "Invalid cHRM white point");
      png_crc_finish(png_ptr, 24);
      return;
   }
+   int_x_white = (png_fixed_point)uint_x;
+   int_y_white = (png_fixed_point)uint_y;

   png_crc_read(png_ptr, buf, 4);
-   int_x_red = (png_fixed_point)png_get_uint_32(buf);
+   uint_x = png_get_uint_32(buf);

   png_crc_read(png_ptr, buf, 4);
-   int_y_red = (png_fixed_point)png_get_uint_32(buf);
+   uint_y = png_get_uint_32(buf);

-   if (int_x_red > 80000L || int_y_red > 80000L ||
-      int_x_red + int_y_red > 100000L)
+   if (uint_x > 80000L || uint_y > 80000L ||
+      uint_x + uint_y > 100000L)
   {
      png_warning(png_ptr, "Invalid cHRM red point");
      png_crc_finish(png_ptr, 16);
      return;
   }
+   int_x_red = (png_fixed_point)uint_x;
+   int_y_red = (png_fixed_point)uint_y;

   png_crc_read(png_ptr, buf, 4);
-   int_x_green = (png_fixed_point)png_get_uint_32(buf);
+   uint_x = png_get_uint_32(buf);

   png_crc_read(png_ptr, buf, 4);
-   int_y_green = (png_fixed_point)png_get_uint_32(buf);
+   uint_y = png_get_uint_32(buf);

-   if (int_x_green > 80000L || int_y_green > 80000L ||
-      int_x_green + int_y_green > 100000L)
+   if (uint_x > 80000L || uint_y > 80000L ||
+      uint_x + uint_y > 100000L)
   {
      png_warning(png_ptr, "Invalid cHRM green point");
      png_crc_finish(png_ptr, 8);
      return;
   }
+   int_x_green = (png_fixed_point)uint_x;
+   int_y_green = (png_fixed_point)uint_y;

   png_crc_read(png_ptr, buf, 4);
-   int_x_blue = (png_fixed_point)png_get_uint_32(buf);
+   uint_x = png_get_uint_32(buf);

   png_crc_read(png_ptr, buf, 4);
-   int_y_blue = (png_fixed_point)png_get_uint_32(buf);
+   uint_y = png_get_uint_32(buf);

-   if (int_x_blue > 80000L || int_y_blue > 80000L ||
-      int_x_blue + int_y_blue > 100000L)
+   if (uint_x > 80000L || uint_y > 80000L ||
+      uint_x + uint_y > 100000L)
   {
      png_warning(png_ptr, "Invalid cHRM blue point");
      png_crc_finish(png_ptr, 0);
      return;
   }
+   int_x_blue = (png_fixed_point)uint_x;
+   int_y_blue = (png_fixed_point)uint_y;
+
 #ifdef PNG_FLOATING_POINT_SUPPORTED
   white_x = (float)int_x_white / (float)100000.0;
   white_y = (float)int_y_white / (float)100000.0;
@@ -894,17 +905,6 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
      igamma=(int)(info_ptr->gamma * 100000.);
 #  endif
-#endif
-#if 0 && defined(PNG_cHRM_SUPPORTED) && !defined(PNG_FIXED_POINT_SUPPORTED)
-/* We need to define these here because they aren't in png.h */
-   png_fixed_point int_x_white;
-   png_fixed_point int_y_white;
-   png_fixed_point int_x_red;
-   png_fixed_point int_y_red;
-   png_fixed_point int_x_green;
-   png_fixed_point int_y_green;
-   png_fixed_point int_x_blue;
-   png_fixed_point int_y_blue;
 #endif
      if(igamma < 45000L || igamma > 46000L)
      {
@@ -952,6 +952,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
   png_charp chunkdata;
   png_byte compression_type;
+   png_bytep pC;
   png_charp profile;
   png_uint_32 skip = 0;
   png_uint_32 profile_size = 0;
@@ -1029,7 +1030,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)

   profile_length = data_length - prefix_length;

-   if ( profile_length < 4)
+   if ( prefix_length > data_length || profile_length < 4)
   {
      png_free(png_ptr, chunkdata);
      png_warning(png_ptr, "Profile size field missing from iCCP chunk");
@@ -1037,10 +1038,11 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
   }

   /* Check the profile_size recorded in the first 32 bits of the ICC profile */
-   profile_size = ((*(chunkdata+prefix_length))<<24) |
-                  ((*(chunkdata+prefix_length+1))<<16) |
-                  ((*(chunkdata+prefix_length+2))<< 8) |
-                  ((*(chunkdata+prefix_length+3))    );
+   pC = (png_bytep)(chunkdata+prefix_length);
+   profile_size = ((*(pC  ))<<24) |
+                  ((*(pC+1))<<16) |
+                  ((*(pC+2))<< 8) |
+                  ((*(pC+3))    );

   if(profile_size < profile_length)
      profile_length = profile_size;
--- a/pngset.c
+++ b/pngset.c
@@ -1,9 +1,9 @@

 /* pngset.c - storage of image information into info struct
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -40,6 +40,25 @@ png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr == NULL || info_ptr == NULL)
      return;

+   if (white_x < 0.0 || white_y < 0.0 ||
+         red_x < 0.0 ||   red_y < 0.0 ||
+       green_x < 0.0 || green_y < 0.0 ||
+        blue_x < 0.0 ||  blue_y < 0.0)
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set negative chromaticity value");
+      return;
+   }
+   if (white_x > 21474.83 || white_y > 21474.83 ||
+         red_x > 21474.83 ||   red_y > 21474.83 ||
+       green_x > 21474.83 || green_y > 21474.83 ||
+        blue_x > 21474.83 ||  blue_y > 21474.83)
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set chromaticity value exceeding 21474.83");
+      return;
+   }
+
   info_ptr->x_white = (float)white_x;
   info_ptr->y_white = (float)white_y;
   info_ptr->x_red   = (float)red_x;
@@ -51,12 +70,12 @@ png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_FIXED_POINT_SUPPORTED
   info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
   info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
-   info_ptr->int_x_red   = (png_fixed_point)(red_x*100000.+0.5);
-   info_ptr->int_y_red   = (png_fixed_point)(red_y*100000.+0.5);
+   info_ptr->int_x_red   = (png_fixed_point)(  red_x*100000.+0.5);
+   info_ptr->int_y_red   = (png_fixed_point)(  red_y*100000.+0.5);
   info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
   info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
-   info_ptr->int_x_blue  = (png_fixed_point)(blue_x*100000.+0.5);
-   info_ptr->int_y_blue  = (png_fixed_point)(blue_y*100000.+0.5);
+   info_ptr->int_x_blue  = (png_fixed_point)( blue_x*100000.+0.5);
+   info_ptr->int_y_blue  = (png_fixed_point)( blue_y*100000.+0.5);
 #endif
   info_ptr->valid |= PNG_INFO_cHRM;
 }
@@ -72,6 +91,24 @@ png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
   if (png_ptr == NULL || info_ptr == NULL)
      return;

+   if (white_x < 0 || white_y < 0 ||
+         red_x < 0 ||   red_y < 0 ||
+       green_x < 0 || green_y < 0 ||
+        blue_x < 0 ||  blue_y < 0)
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set negative chromaticity value");
+      return;
+   }
+   if (white_x > (double) PNG_MAX_UINT || white_y > (double) PNG_MAX_UINT ||
+         red_x > (double) PNG_MAX_UINT ||   red_y > (double) PNG_MAX_UINT ||
+       green_x > (double) PNG_MAX_UINT || green_y > (double) PNG_MAX_UINT ||
+        blue_x > (double) PNG_MAX_UINT ||  blue_y > (double) PNG_MAX_UINT)
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set chromaticity value exceeding 21474.83");
+      return;
+   }
   info_ptr->int_x_white = white_x;
   info_ptr->int_y_white = white_y;
   info_ptr->int_x_red   = red_x;
@@ -83,12 +120,12 @@ png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_FLOATING_POINT_SUPPORTED
   info_ptr->x_white = (float)(white_x/100000.);
   info_ptr->y_white = (float)(white_y/100000.);
-   info_ptr->x_red   = (float)(red_x/100000.);
-   info_ptr->y_red   = (float)(red_y/100000.);
+   info_ptr->x_red   = (float)(  red_x/100000.);
+   info_ptr->y_red   = (float)(  red_y/100000.);
   info_ptr->x_green = (float)(green_x/100000.);
   info_ptr->y_green = (float)(green_y/100000.);
-   info_ptr->x_blue  = (float)(blue_x/100000.);
-   info_ptr->y_blue  = (float)(blue_y/100000.);
+   info_ptr->x_blue  = (float)( blue_x/100000.);
+   info_ptr->y_blue  = (float)( blue_y/100000.);
 #endif
   info_ptr->valid |= PNG_INFO_cHRM;
 }
@@ -100,16 +137,25 @@ png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
 void PNGAPI
 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
 {
+   double gamma;
   png_debug1(1, "in %s storage function\n", "gAMA");
   if (png_ptr == NULL || info_ptr == NULL)
      return;

-   info_ptr->gamma = (float)file_gamma;
+   /* Check for overflow */
+   if (file_gamma > 21474.83)
+   {
+      png_warning(png_ptr, "Limiting gamma to 21474.83");
+      gamma=21474.83;
+   }
+   else
+      gamma=file_gamma;
+   info_ptr->gamma = (float)gamma;
 #ifdef PNG_FIXED_POINT_SUPPORTED
-   info_ptr->int_gamma = (int)(file_gamma*100000.+.5);
+   info_ptr->int_gamma = (int)(gamma*100000.+.5);
 #endif
   info_ptr->valid |= PNG_INFO_gAMA;
-   if(file_gamma == 0.0)
+   if(gamma == 0.0)
      png_warning(png_ptr, "Setting gamma=0");
 }
 #endif
@@ -117,18 +163,35 @@ void PNGAPI
 png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
   int_gamma)
 {
+   png_fixed_point gamma;
+
   png_debug1(1, "in %s storage function\n", "gAMA");
   if (png_ptr == NULL || info_ptr == NULL)
      return;

+   if (int_gamma > (png_fixed_point) PNG_MAX_UINT)
+   {
+     png_warning(png_ptr, "Limiting gamma to 21474.83");
+     gamma=PNG_MAX_UINT;
+   }
+   else
+   {
+     if (int_gamma < 0)
+     {
+       png_warning(png_ptr, "Setting negative gamma to zero");
+       gamma=0;
+     }
+     else
+       gamma=int_gamma;
+   }
 #ifdef PNG_FLOATING_POINT_SUPPORTED
-   info_ptr->gamma = (float)(int_gamma/100000.);
+   info_ptr->gamma = (float)(gamma/100000.);
 #endif
 #ifdef PNG_FIXED_POINT_SUPPORTED
-   info_ptr->int_gamma = int_gamma;
+   info_ptr->int_gamma = gamma;
 #endif
   info_ptr->valid |= PNG_INFO_gAMA;
-   if(int_gamma == 0)
+   if(gamma == 0)
      png_warning(png_ptr, "Setting gamma=0");
 }
 #endif
@@ -152,8 +215,9 @@ png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
 #ifdef PNG_FREE_ME_SUPPORTED
   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
 #endif
+   /* Changed from info->num_palette to 256 in version 1.2.1 */
   png_ptr->hist = (png_uint_16p)png_malloc(png_ptr,
-      (png_uint_32)(info_ptr->num_palette * sizeof (png_uint_16)));
+      (png_uint_32)(256 * sizeof (png_uint_16)));

   for (i = 0; i < info_ptr->num_palette; i++)
       png_ptr->hist[i] = hist[i];
@@ -410,8 +474,12 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_FREE_ME_SUPPORTED
   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
 #endif
-   png_ptr->palette = (png_colorp)png_zalloc(png_ptr, (uInt)num_palette,
+   /* Changed in libpng-1.2.1 to allocate 256 instead of num_palette entries,
+      in case of an invalid PNG file that has too-large sample values. */
+   png_ptr->palette = (png_colorp)png_zalloc(png_ptr, (uInt)256,
      sizeof (png_color));
+   if (png_ptr->palette == NULL)
+      png_error(png_ptr, "Unable to malloc palette");
   png_memcpy(png_ptr->palette, palette, num_palette * sizeof (png_color));
   info_ptr->palette = png_ptr->palette;
   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
@@ -620,7 +688,7 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 #ifdef PNG_iTXt_SUPPORTED
      {
        /* set iTXt data */
-        if (text_ptr[i].key != NULL)
+        if (text_ptr[i].lang != NULL)
          lang_len = png_strlen(text_ptr[i].lang);
        else
          lang_len = 0;
@@ -740,8 +808,9 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_FREE_ME_SUPPORTED
       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
 #endif
+       /* Changed from num_trans to 256 in version 1.2.1 */
       png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
-           (png_uint_32)num_trans);
+           (png_uint_32)256);
       png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
 #ifdef PNG_FREE_ME_SUPPORTED
       info_ptr->free_me |= PNG_FREE_TRNS;
@@ -973,6 +1042,7 @@ png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
 }


+#ifndef PNG_1_0_X
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
 /* this function was added to libpng 1.2.0 and should always exist by default */
 void PNGAPI
@@ -1027,3 +1097,4 @@ png_set_mmx_thresholds (png_structp png_ptr,
    png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold;
 }
 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
+#endif /* ?PNG_1_0_X */
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,9 +1,9 @@

 /* pngtest.c - a simple test program to test libpng
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -1512,4 +1512,4 @@ main(int argc, char *argv[])
 }

 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_1beta4 your_png_h_is_not_version_1_2_1beta4;
+typedef version_1_2_3rc6 your_png_h_is_not_version_1_2_3rc6;
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -1,9 +1,9 @@

 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 */
--- a/pngvcrd.c
+++ b/pngvcrd.c
@@ -2,9 +2,9 @@
 *
 * For Intel x86 CPU and Microsoft Visual C++ compiler
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng version 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * Copyright (c) 1998, Intel Corporation
 *
 * Contributed by Nirav Chhatrapati, Intel Corporation, 1998
@@ -39,6 +39,7 @@ png_mmx_support(void)
    push ebx          //CPUID will trash these
    push ecx
    push edx
+
    pushfd            //Save Eflag to stack
    pop eax           //Get Eflag from stack into eax
    mov ecx, eax      //Make another copy of Eflag in ecx
@@ -48,6 +49,8 @@ png_mmx_support(void)
    popfd             //Restored modified value back to Eflag reg
    pushfd            //Save Eflag to stack
    pop eax           //Get Eflag from stack
+    push ecx          // save original Eflag to stack
+    popfd             // restore original Eflag
    xor eax, ecx      //Compare the new Eflag with the original Eflag
    jz NOT_SUPPORTED  //If the same, CPUID instruction is not supported,
                      //skip following instructions and jump to
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,9 +1,9 @@

 /* pngwio.c - functions for data output
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
@@ -40,7 +40,7 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
   write_data function and use it at run time with png_set_write_fn(), rather
   than changing the library. */
 #ifndef USE_FAR_KEYWORD
-static void /* PRIVATE */
+void PNGAPI
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
   png_uint_32 check;
@@ -63,7 +63,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)

-static void /* PRIVATE */
+void PNGAPI
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
   png_uint_32 check;
@@ -126,7 +126,7 @@ png_flush(png_structp png_ptr)
 }

 #if !defined(PNG_NO_STDIO)
-static void /* PRIVATE */
+void PNGAPI
 png_default_flush(png_structp png_ptr)
 {
 #if !defined(_WIN32_WCE)
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -1,9 +1,9 @@

 /* pngwrite.c - general routines to write a PNG file
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 */
@@ -443,16 +443,19 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
   int i;
   png_debug(1, "in png_create_write_struct\n");
 #ifdef PNG_USER_MEM_SUPPORTED
-   if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
-      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr)) == NULL)
+   png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
+      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
 #else
-   if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
+   png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
 #endif /* PNG_USER_MEM_SUPPORTED */
+   if (png_ptr == NULL)
      return (NULL);

+#if !defined(PNG_1_0_X)
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
 #endif
+#endif /* PNG_1_0_X */

 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
@@ -527,7 +530,20 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
      1, png_doublep_NULL, png_doublep_NULL);
 #endif

-   return ((png_structp)png_ptr);
+#ifdef PNG_SETJMP_SUPPORTED
+/* Applications that neglect to set up their own setjmp() and then encounter
+   a png_error() will longjmp here.  Since the jmpbuf is then meaningless we
+   abort instead of returning. */
+#ifdef USE_FAR_KEYWORD
+   if (setjmp(jmpbuf))
+      PNG_ABORT();
+   png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+#else
+   if (setjmp(png_ptr->jmpbuf))
+      PNG_ABORT();
+#endif
+#endif
+   return (png_ptr);
 }

 /* Initialize png_ptr structure, and allocate any memory needed */
@@ -624,9 +640,11 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
   /* reset all variables to 0 */
   png_memset(png_ptr, 0, sizeof (png_struct));

+#if !defined(PNG_1_0_X)
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
 #endif
+#endif /* PNG_1_0_X */

 #ifdef PNG_SETJMP_SUPPORTED
   /* restore jump buffer */
@@ -948,6 +966,7 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
      png_ptr = *png_ptr_ptr;
 #ifdef PNG_USER_MEM_SUPPORTED
      free_fn = png_ptr->free_fn;
+      mem_ptr = png_ptr->mem_ptr;
 #endif
   }

--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,9 +1,9 @@

 /* pngwtran.c - transforms the data in a row for PNG writers
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 */
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -1,9 +1,9 @@

 /* pngwutil.c - utilities to write a PNG file
 *
- * libpng 1.2.1beta4 - November 7, 2001
+ * libpng 1.2.3rc6 - May 13, 2002
 * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 */
@@ -1349,22 +1349,28 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
      png_warning(png_ptr, "Empty keyword in iTXt chunk");
      return;
   }
-   if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang,
-      &new_lang))==0)
+   if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang, &new_lang))==0)
   {
      png_warning(png_ptr, "Empty language field in iTXt chunk");
-      return;
+      new_lang = NULL;
+      lang_len = 0;      
   }
-   lang_key_len = png_strlen(lang_key);
-   text_len = png_strlen(text);

-   if (text == NULL || *text == '\0')
+   if (lang_key == NULL)
+     lang_key_len = 0;
+   else
+     lang_key_len = png_strlen(lang_key);
+
+   if (text == NULL)
      text_len = 0;
+   else
+     text_len = png_strlen(text);

   /* compute the compressed data; do it now for the length */
   text_len = png_text_compress(png_ptr, text, text_len, compression-2,
      &comp);

+
   /* make sure we include the compression flag, the compression byte,
    * and the NULs after the key, lang, and lang_key parts */

@@ -1394,15 +1400,15 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
   cbuf[1] = 0;
   png_write_chunk_data(png_ptr, cbuf, 2);

-   png_write_chunk_data(png_ptr, (png_bytep)new_lang, lang_len + 1);
-   png_write_chunk_data(png_ptr, (png_bytep)lang_key, lang_key_len+1);
-   png_write_chunk_data(png_ptr, '\0', 1);
-
+   cbuf[0] = 0;
+   png_write_chunk_data(png_ptr, (new_lang ? (png_bytep)new_lang : cbuf), lang_len + 1);
+   png_write_chunk_data(png_ptr, (lang_key ? (png_bytep)lang_key : cbuf), lang_key_len + 1);
   png_write_compressed_data_out(png_ptr, &comp);

   png_write_chunk_end(png_ptr);
   png_free(png_ptr, new_key);
-   png_free(png_ptr, new_lang);
+   if (new_lang)
+     png_free(png_ptr, new_lang);
 }
 #endif

--- a/projects/msvc/README.txt
+++ b/projects/msvc/README.txt
@@ -1,5 +1,5 @@
 Microsoft Developer Studio Build File, Format Version 6.00 for
-libpng 1.2.1beta4 (November 7, 2001) and zlib
+libpng 1.2.3rc6 (May 13, 2002) and zlib

 Copyright (C) 2000 Simon-Pierre Cadieux
 For conditions of distribution and use, see copyright notice in png.h
@@ -24,12 +24,12 @@ To build:
 This project will build the PNG Development Group's "official" versions of
 libpng and zlib libraries:

-   libpng3.dll          (default version, currently C code only)
-   libpng3.dll         (C + Assembler version)
-   libpng3.dll         (C + Assembler debug version)
-   libpng3.dll         (C code debug version)
-   libpng3[c,e-m].dll   (reserved for official versions) 
-   libpng3[n-z].dll     (available for private versions)
+   libpng12.dll          (default version, currently C code only)
+   libpng12.dll         (C + Assembler version)
+   libpng12.dll         (C + Assembler debug version)
+   libpng12.dll         (C code debug version)
+   libpng12[c,e-m].dll   (reserved for official versions) 
+   libpng12[n-z].dll     (available for private versions)
   zlib.dll             (default version, currently C code only)
   zlibd.dll            (debug version)

--- a/projects/msvc/libpng.dsp
+++ b/projects/msvc/libpng.dsp
@@ -24,6 +24,7 @@ CFG=libpng - Win32 DLL
 !MESSAGE "libpng - Win32 DLL Debug ASM" (based on "Win32 (x86) Dynamic-Link Library")
 !MESSAGE "libpng - Win32 LIB" (based on "Win32 (x86) Static Library")
 !MESSAGE "libpng - Win32 LIB Debug" (based on "Win32 (x86) Static Library")
+!MESSAGE "libpng - Win32 DLL VB" (based on "Win32 (x86) Dynamic-Link Library")
 !MESSAGE 

 # Begin Project
@@ -56,7 +57,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /dll /machine:I386
-# ADD LINK32 /nologo /dll /machine:I386 /out:".\win32\libpng\dll\libpng3.dll"
+# ADD LINK32 /nologo /dll /machine:I386 /out:".\win32\libpng\dll\libpng12.dll"
 # SUBTRACT LINK32 /pdb:none

 !ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
@@ -84,7 +85,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /dll /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 /nologo /dll /debug /machine:I386 /out:".\win32\libpng\dll_dbg\libpng3d.dll"
+# ADD LINK32 /nologo /dll /debug /machine:I386 /out:".\win32\libpng\dll_dbg\libpng12d.dll"

 !ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM"

@@ -111,7 +112,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /dll /machine:I386
-# ADD LINK32 /nologo /dll /machine:I386 /out:".\win32\libpng\dll_asm\libpng3a.dll"
+# ADD LINK32 /nologo /dll /machine:I386 /out:".\win32\libpng\dll_asm\libpng12a.dll"
 # SUBTRACT LINK32 /pdb:none

 !ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug ASM"
@@ -133,13 +134,13 @@ CPP=cl.exe
 MTL=midl.exe
 RSC=rc.exe
 # ADD BASE RSC /l 0x409 /d "_DEBUG"
-# ADD RSC /l 0x409 /i "..\.." /d "_DEBUG" /d PNG_DEBUG=1  /d "PNG_USE_PNGVCRD"
+# ADD RSC /l 0x409 /i "..\.." /d "_DEBUG" /d PNG_DEBUG=1 /d "PNG_USE_PNGVCRD"
 BSC32=bscmake.exe
 # ADD BASE BSC32 /nologo
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 /nologo /dll /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 /nologo /dll /debug /machine:I386 /out:".\win32\libpng\dll_dbga\libpng3b.dll"
+# ADD LINK32 /nologo /dll /debug /machine:I386 /out:".\win32\libpng\dll_dbga\libpng12b.dll"

 !ELSEIF  "$(CFG)" == "libpng - Win32 LIB"

@@ -193,6 +194,36 @@ LIB32=link.exe -lib
 # ADD BASE LIB32 /nologo
 # ADD LIB32 /nologo

+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL VB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "libpng___Win32_DLL_VB"
+# PROP BASE Intermediate_Dir "libpng___Win32_DLL_VB"
+# PROP BASE Ignore_Export_Lib 0
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\libpng\dll_vb"
+# PROP Intermediate_Dir ".\win32\libpng\dll_vb"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MD /W3 /O1 /I "..\.." /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "PNG_BUILD_DLL" /D "ZLIB_DLL" /Yu"png.h" /FD /c
+# ADD CPP /nologo /Gd /MD /W3 /O1 /I "..\.." /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "PNG_BUILD_DLL" /D "ZLIB_DLL" /D PNGAPI=__stdcall /Yu"png.h" /FD /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /i "..\.." /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /machine:I386 /out:".\win32\libpng\dll\libpng12.dll"
+# SUBTRACT BASE LINK32 /pdb:none
+# ADD LINK32 /nologo /dll /machine:I386 /out:".\win32\libpng\dll_vb\libpngvb12.dll"
+# SUBTRACT LINK32 /pdb:none
+
 !ENDIF 

 # Begin Target
@@ -203,6 +234,7 @@ LIB32=link.exe -lib
 # Name "libpng - Win32 DLL Debug ASM"
 # Name "libpng - Win32 LIB"
 # Name "libpng - Win32 LIB Debug"
+# Name "libpng - Win32 DLL VB"
 # Begin Group "Source Files"

 # PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
@@ -231,6 +263,8 @@ SOURCE=.\png.rc

 # PROP Exclude_From_Build 1

+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL VB"
+
 !ENDIF 

 # End Source File
@@ -254,6 +288,8 @@ SOURCE=.\png32ms.def

 # PROP Exclude_From_Build 1

+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL VB"
+
 !ENDIF 

 # End Source File
@@ -322,6 +358,11 @@ SOURCE=..\..\pngvcrd.c

 # PROP Exclude_From_Build 1

+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL VB"
+
+# PROP BASE Exclude_From_Build 1
+# PROP Exclude_From_Build 1
+
 !ENDIF 

 # End Source File
@@ -361,7 +402,38 @@ SOURCE=..\..\pngconf.h
 # Begin Source File

 SOURCE=.\readme.txt
+
+!IF  "$(CFG)" == "libpng - Win32 DLL"
+
 # PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug ASM"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL VB"
+
+# PROP BASE Exclude_From_Build 1
+# PROP Exclude_From_Build 1
+
+!ENDIF 
+
 # End Source File
 # End Target
 # End Project
--- a/projects/msvc/png.rc
+++ b/projects/msvc/png.rc
@@ -81,7 +81,7 @@ BEGIN
      VALUE "FileDescription", "PNG image compression library\000"
      VALUE "FileVersion", PNG_LIBPNG_VER_STRING "\000"
      VALUE "InternalName", PNG_LIBPNG_DLLFNAME QUOTE(PNG_LIBPNG_VER_MAJOR) DLLFNAME_POSTFIX " (Windows 32 bit)\000"
-      VALUE "LegalCopyright", "\251 1998-2000 Glenn Randers-Pehrson\000"
+      VALUE "LegalCopyright", "\251 1998-2002 Glenn Randers-Pehrson\000"
      VALUE "OriginalFilename", PNG_LIBPNG_DLLFNAME QUOTE(PNG_LIBPNG_VER_MAJOR) DLLFNAME_POSTFIX ".DLL\000"
 #ifdef PRIVATEBUILD
      VALUE "PrivateBuild", PRIVATEBUILD
--- a/projects/msvc/png32ms.def
+++ b/projects/msvc/png32ms.def
@@ -6,7 +6,7 @@ LIBRARY
 DESCRIPTION "PNG image compression library for Windows"

 EXPORTS
-;Version 1.2.1beta4
+;Version 1.2.3rc6
  png_build_grayscale_palette  @1
  png_check_sig        @2
  png_chunk_error      @3
@@ -211,3 +211,8 @@ EXPORTS
  png_init_mmx_flags  @192
 ; Strip error numbers
  png_set_strip_error_numbers @193
+; Added at version 1.2.2
+  png_handle_as_unknown @194
+; Added at version 1.2.2 and deleted from 1.2.3
+; png_zalloc @195
+; png_zfree @196
--- a/projects/msvc/zlib.dsp
+++ b/projects/msvc/zlib.dsp
@@ -24,6 +24,7 @@ CFG=zlib - Win32 DLL
 !MESSAGE "zlib - Win32 DLL Debug ASM" (based on "Win32 (x86) Dynamic-Link Library")
 !MESSAGE "zlib - Win32 LIB" (based on "Win32 (x86) Static Library")
 !MESSAGE "zlib - Win32 LIB Debug" (based on "Win32 (x86) Static Library")
+!MESSAGE "zlib - Win32 DLL VB" (based on "Win32 (x86) Dynamic-Link Library")
 !MESSAGE 

 # Begin Project
@@ -193,6 +194,36 @@ LIB32=link.exe -lib
 # ADD BASE LIB32 /nologo
 # ADD LIB32 /nologo

+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL VB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "zlib___Win32_DLL_VB"
+# PROP BASE Intermediate_Dir "zlib___Win32_DLL_VB"
+# PROP BASE Ignore_Export_Lib 0
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\zlib\dll_vb"
+# PROP Intermediate_Dir ".\win32\zlib\dll_vb"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MD /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "ZLIB_DLL" /FD /c
+# ADD CPP /nologo /Gd /MD /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "ZLIB_DLL" /FD /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /machine:I386
+# SUBTRACT BASE LINK32 /pdb:none
+# ADD LINK32 /nologo /dll /machine:I386 /out:".\win32\zlib\dll_vb/zlibvb.dll"
+# SUBTRACT LINK32 /pdb:none
+
 !ENDIF 

 # Begin Target
@@ -203,6 +234,7 @@ LIB32=link.exe -lib
 # Name "zlib - Win32 DLL Debug ASM"
 # Name "zlib - Win32 LIB"
 # Name "zlib - Win32 LIB Debug"
+# Name "zlib - Win32 DLL VB"
 # Begin Group "Source Files"

 # PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
@@ -246,6 +278,11 @@ SOURCE=..\..\..\zlib\contrib\asm386\gvmat32c.c

 # PROP Exclude_From_Build 1

+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL VB"
+
+# PROP BASE Exclude_From_Build 1
+# PROP Exclude_From_Build 1
+
 !ENDIF 

 # End Source File
@@ -312,6 +349,8 @@ SOURCE=.\zlib.def

 # PROP Exclude_From_Build 1

+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL VB"
+
 !ENDIF 

 # End Source File
@@ -335,6 +374,8 @@ SOURCE=..\..\..\zlib\msdos\zlib.rc

 # PROP Exclude_From_Build 1

+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL VB"
+
 !ENDIF 

 # End Source File
--- a/projects/netware.txt
+++ b/projects/netware.txt
@@ -1,6 +1,6 @@
 A set of project files is available for Netware.  Get
-libpng-1.2.1beta4-project-netware.zip from a libpng distribution
+libpng-1.2.3rc6-project-netware.zip from a libpng distribution
 site such as http://libpng.sourceforge.net

 Put the zip file in this directory (projects) and then run
-"unzip -a libpng-1.2.1beta4-project-netware.zip"
+"unzip -a libpng-1.2.3rc6-project-netware.zip"
--- a/projects/wince.txt
+++ b/projects/wince.txt
@@ -1,6 +1,6 @@
 A set of project files is available for WinCE.  Get
-libpng-1.2.1beta4-project-wince.zip from a libpng distribution
+libpng-1.2.3rc6-project-wince.zip from a libpng distribution
 site such as http://libpng.sourceforge.net

 Put the zip file in this directory (projects) and then run
-"unzip -a libpng-1.2.1beta4-project-wince.zip"
+"unzip -a libpng-1.2.3rc6-project-wince.zip"
--- a/scripts/libpng-config-body.in
+++ b/scripts/libpng-config-body.in
@@ -0,0 +1,65 @@
+
+usage()
+{
+    cat <<EOF
+Usage: libpng-config [OPTION] ...
+
+Known values for OPTION are:
+
+  --prefix              print libpng prefix
+  --libs                print library linking information
+  --cflags              print compiler flags
+  --cppflags            print pre-processor flags
+  --ldflags             print loader flags
+  --help                display this help and exit
+  --version             output version information
+EOF
+
+    exit $1
+}
+
+if test $# -eq 0; then
+    usage 1
+fi
+
+while test $# -gt 0; do
+    case "$1" in
+
+    --prefix)
+        echo ${prefix}
+        ;;
+
+    --version)
+        echo ${version}
+        exit 0
+        ;;
+
+    --help)
+        usage 0
+        ;;
+
+    --cflags)
+        echo ${cflags}
+        ;;
+
+    --cppflags)
+        echo ${cppflags}
+        ;;
+
+    --libs)
+        echo ${libs}
+        ;;
+
+    --ldflags)
+        echo ${ldflags}
+        ;;
+
+    *)
+        usage
+        exit 1
+        ;;
+    esac
+    shift
+done
+
+exit 0
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -0,0 +1,17 @@
+#! /bin/sh
+
+# libpng-config
+# provides configuration info for libpng.
+
+# Copyright (C) 2002 Glenn Randers-Pehrson
+# For conditions of distribution and use, see copyright notice in png.h
+
+# Modeled after libxml-config.
+
+version=1.2.3rc6
+prefix=""
+cppflags=""
+cflags=""
+ldflags=""
+libs=""
+
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -0,0 +1,11 @@
+
+prefix=@PREFIX@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${exec_prefix}/include
+
+Name: libpng12
+Description: Loads and saves PNG files
+Version: 1.2.3rc6
+Libs: -L${libdir} -lpng12 -lz -lm
+Cflags: -I${includedir}/libpng12
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -0,0 +1,204 @@
+# makefile for libpng on Solaris 2.x with gcc
+# Contributed by William L. Sebok, based on makefile.linux
+# Copyright (C) 2002 Glenn Randers-Pehrson
+# Copyright (C) 1998 Greg Roelofs
+# Copyright (C) 1996, 1997 Andreas Dilger
+# For conditions of distribution and use, see copyright notice in png.h
+
+CC=cc
+SUN_CC_FLAGS=-fast -xtarget=ultra
+SUN_LD_FLAGS=-fast -xtarget=ultra
+
+# where make install puts libpng.a, libpng12.so and libpng12/png.h
+prefix=/a
+
+# Where the zlib library and include files are located
+# Changing these to ../zlib poses a security risk.  If you want
+# to have zlib in an adjacent directory, specify the full path instead of "..".
+#ZLIBLIB=../zlib
+#ZLIBINC=../zlib
+
+ZLIBLIB=/usr/lib
+ZLIBINC=/usr/include
+
+WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
+	-Wmissing-declarations -Wtraditional -Wcast-align \
+	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
+CFLAGS=-I$(ZLIBINC) $(SUN_CC_FLAGS) \
+	# $(WARNMORE) -g -DPNG_DEBUG=5
+LDFLAGS=-L. -R. $(SUN_LD_FLAGS) -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng12 -lz -lm
+
+#RANLIB=ranlib
+RANLIB=echo
+
+LIBNAME=libpng12
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=
+
+OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
+	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
+	pngwtran.o pngmem.o pngerror.o pngpread.o
+
+OBJSDLL = $(OBJS:.o=.pic.o)
+
+.SUFFIXES:      .c .o .pic.o
+
+.c.pic.o:
+	$(CC) -c $(CFLAGS) -KPIC -o $@ $*.c
+
+all: libpng.a $(LIBNAME).so pngtest
+
+libpng.a: $(OBJS)
+	ar rc $@ $(OBJS)
+	$(RANLIB) $@
+
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc
+
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"-xtarget=ultra\"; \
+	echo ldflags=\"-xtarget=ultra -L$(LIBPATH) -R$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config
+
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so
+
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)
+
+$(LIBNAME).so.$(PNGVER): $(OBJSDLL)
+	@case "`type ld`" in *ucb*) \
+	echo; \
+	echo '## WARNING:'; \
+	echo '## The commands "CC" and "LD" must NOT refer to /usr/ucb/cc'; \
+	echo '## and /usr/ucb/ld.  If they do, you need to adjust your PATH'; \
+	echo '## environment variable to put /usr/ccs/bin ahead of /usr/ucb.'; \
+	echo '## The environment variable LD_LIBRARY_PATH should not be set'; \
+	echo '## at all.  If it is, things are likely to break because of'; \
+	echo '## the libucb dependency that is created.'; \
+	echo; \
+	;; \
+	esac
+	$(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h $(LIBNAME).so.$(PNGMAJ) \
+	 -o $(LIBNAME).so.$(PNGVER) $(OBJSDLL) -lz
+
+pngtest: pngtest.o $(LIBNAME).so
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+	./pngtest
+
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -f -s $(LIBNAME) libpng; \
+	ln -f -s $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -f -s $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng12.pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/libpng12.pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/libpng12.pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -f -s libpng12.pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng12-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/libpng12-config
+	chmod 755 $(DESTDIR)$(BINPATH)/libpng12-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf libpng12-config libpng-config)
+
+install: install-static install-shared install-man install-config
+
+clean:
+	/bin/rm -f *.o libpng.a $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)* \
+	pngtest pngout.png
+
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+	chmod a-w *.[ch35] $(DOCS) scripts/*
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o png.pic.o: png.h pngconf.h
+pngerror.o pngerror.pic.o: png.h pngconf.h
+pngrio.o pngrio.pic.o: png.h pngconf.h
+pngwio.o pngwio.pic.o: png.h pngconf.h
+pngmem.o pngmem.pic.o: png.h pngconf.h
+pngset.o pngset.pic.o: png.h pngconf.h
+pngget.o pngget.pic.o: png.h pngconf.h
+pngread.o pngread.pic.o: png.h pngconf.h
+pngrtran.o pngrtran.pic.o: png.h pngconf.h
+pngrutil.o pngrutil.pic.o: png.h pngconf.h
+pngtrans.o pngtrans.pic.o: png.h pngconf.h
+pngwrite.o pngwrite.pic.o: png.h pngconf.h
+pngwtran.o pngwtran.pic.o: png.h pngconf.h
+pngwutil.o pngwutil.pic.o: png.h pngconf.h
+pngpread.o pngpread.pic.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -0,0 +1,204 @@
+# makefile for libpng on Solaris 2.x with gcc
+# Contributed by William L. Sebok, based on makefile.linux
+# Copyright (C) 2002 Glenn Randers-Pehrson
+# Copyright (C) 1998 Greg Roelofs
+# Copyright (C) 1996, 1997 Andreas Dilger
+# For conditions of distribution and use, see copyright notice in png.h
+
+CC=cc
+SUN_CC_FLAGS=-fast -xtarget=ultra -xarch=v9
+SUN_LD_FLAGS=-fast -xtarget=ultra -xarch=v9
+
+# where make install puts libpng.a, libpng12.so and libpng12/png.h
+prefix=/a
+
+# Where the zlib library and include files are located
+# Changing these to ../zlib poses a security risk.  If you want
+# to have zlib in an adjacent directory, specify the full path instead of "..".
+#ZLIBLIB=../zlib
+#ZLIBINC=../zlib
+
+ZLIBLIB=/usr/lib
+ZLIBINC=/usr/include
+
+WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
+	-Wmissing-declarations -Wtraditional -Wcast-align \
+	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
+CFLAGS=-I$(ZLIBINC) $(SUN_CC_FLAGS) \
+	# $(WARNMORE) -g -DPNG_DEBUG=5
+LDFLAGS=-L. -R. $(SUN_LD_FLAGS) -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng12 -lz -lm
+
+#RANLIB=ranlib
+RANLIB=echo
+
+LIBNAME=libpng12
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=
+
+OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
+	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
+	pngwtran.o pngmem.o pngerror.o pngpread.o
+
+OBJSDLL = $(OBJS:.o=.pic.o)
+
+.SUFFIXES:      .c .o .pic.o
+
+.c.pic.o:
+	$(CC) -c $(CFLAGS) -KPIC -o $@ $*.c
+
+all: libpng.a $(LIBNAME).so pngtest
+
+libpng.a: $(OBJS)
+	ar rc $@ $(OBJS)
+	$(RANLIB) $@
+
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc
+
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"-xtarget=ultra -xarch=v9\"; \
+	echo ldflags=\"-xtarget=ultra -xarch=v9 -L$(LIBPATH) -R$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config
+
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so
+
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)
+
+$(LIBNAME).so.$(PNGVER): $(OBJSDLL)
+	@case "`type ld`" in *ucb*) \
+	echo; \
+	echo '## WARNING:'; \
+	echo '## The commands "CC" and "LD" must NOT refer to /usr/ucb/cc'; \
+	echo '## and /usr/ucb/ld.  If they do, you need to adjust your PATH'; \
+	echo '## environment variable to put /usr/ccs/bin ahead of /usr/ucb.'; \
+	echo '## The environment variable LD_LIBRARY_PATH should not be set'; \
+	echo '## at all.  If it is, things are likely to break because of'; \
+	echo '## the libucb dependency that is created.'; \
+	echo; \
+	;; \
+	esac
+	$(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h $(LIBNAME).so.$(PNGMAJ) \
+	 -o $(LIBNAME).so.$(PNGVER) $(OBJSDLL) -lz
+
+pngtest: pngtest.o $(LIBNAME).so
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+	./pngtest
+
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -f -s $(LIBNAME) libpng; \
+	ln -f -s $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -f -s $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -f -s $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config
+
+clean:
+	/bin/rm -f *.o libpng.a $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)* \
+	pngtest pngout.png
+
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+	chmod a-w *.[ch35] $(DOCS) scripts/*
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o png.pic.o: png.h pngconf.h
+pngerror.o pngerror.pic.o: png.h pngconf.h
+pngrio.o pngrio.pic.o: png.h pngconf.h
+pngwio.o pngwio.pic.o: png.h pngconf.h
+pngmem.o pngmem.pic.o: png.h pngconf.h
+pngset.o pngset.pic.o: png.h pngconf.h
+pngget.o pngget.pic.o: png.h pngconf.h
+pngread.o pngread.pic.o: png.h pngconf.h
+pngrtran.o pngrtran.pic.o: png.h pngconf.h
+pngrutil.o pngrutil.pic.o: png.h pngconf.h
+pngtrans.o pngtrans.pic.o: png.h pngconf.h
+pngwrite.o pngwrite.pic.o: png.h pngconf.h
+pngwtran.o pngwtran.pic.o: png.h pngconf.h
+pngwutil.o pngwutil.pic.o: png.h pngconf.h
+pngpread.o pngpread.pic.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -1,7 +1,8 @@
 # makefile for libpng using gcc (generic, static library)
-# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 2000 Cosmin Truta
 # Copyright (C) 2000 Marc O. Gloor (AIX support added, from makefile.gcc)
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h

 # Location of the zlib library and include files
@@ -15,16 +16,26 @@ AR = ar rcs
 RANLIB = ranlib
 RM = rm -f

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 0.  You should not
 # have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
+PNGMAJ = 0
+PNGMIN = 1.2.3rc4
 PNGVER = $(PNGMAJ).$(PNGMIN)

 prefix=/usr/local
 INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib

+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=
+
 CDEBUG = -g -DPNG_DEBUG=5
 LDDEBUG =
 CRELEASE = -O2
@@ -56,14 +67,20 @@ pngtest$(E): pngtest$(O) libpng$(A)
 	$(LD) -o $@ pngtest$(O) $(LDFLAGS)

 install: libpng.a
-	-@if [ ! -d $(INCPATH)  ]; then mkdir $(INCPATH); fi
-	-@if [ ! -d $(LIBPATH) ]; then mkdir $(LIBPATH); fi
-	cp png.h pngconf.h $(INCPATH)
-	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
-	cp libpng.a $(LIBPATH)
+	-@if [ ! -d $(DESTDIR)$(INCPATH)  ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/libpng  ]; then mkdir \
+	$(DESTDIR)$(INCPATH)/libpng; fi
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@rm $(DESTDIR)$(INCPATH)/png.h
+	-@rm $(DESTDIR)$(INCPATH)/pngconf.h
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/libpng
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/png.h \
+	$(DESTDIR)$(INCPATH)/libpng/pngconf.h
+	(cd $(DESTDIR)$(INCPATH); ln -f -s libpng/* .)
+	cp libpng.a $(DESTDIR)$(LIBPATH)

 clean:
-	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+	/bin/rm -f *.o libpng.a pngtest pngout.png

 png$(O): png.h pngconf.h
 pngerror$(O): png.h pngconf.h
--- a/scripts/makefile.atari
+++ b/scripts/makefile.atari
@@ -1,4 +1,5 @@
 # makefile for libpng
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h
 # modified for LC56/ATARI assumes libz.lib is in same dir and uses default
@@ -10,6 +11,18 @@ LDFLAGS=-lpng -lz -lm

 # where make install puts libpng.a and png.h
 prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 OBJS = $(LBR)(png.o) $(LBR)(pngset.o) $(LBR)(pngget.o) $(LBR)(pngrutil.o)\
 	$(LBR)(pngtrans.o) $(LBR)(pngwutil.o)\
@@ -25,9 +38,14 @@ pngtest.ttp: pngtest.o $(LBR)
 	$(CC) $(CFLAGS) $(LDFLAGS) -o$@ pngtest.o

 install: libpng.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp png.h $(prefix)/include
-	cp pngconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/png.h
-	chmod 644 $(prefix)/include/pngconf.h
+	-@mkdir $(DESTDIR)$(INCPATH)
+	-@mkdir $(DESTDIR)$(INCPATH)/libpng
+	-@mkdir $(DESTDIR)$(LIBPATH)
+	-@rm -f $(DESTDIR)$(INCPATH)/png.h
+	-@rm -f $(DESTDIR)$(INCPATH)/pngconf.h
+	cp png.h $(DESTDIR)$(INCPATH)/libpng
+	cp pngconf.h $(DESTDIR)$(INCPATH)/libpng
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/png.h
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/pngconf.h
+	(cd $(DESTDIR)$(INCPATH); ln -f -s $(LIBNAME) libpng; \
+	ln -f -s $(LIBNAME)/* .)
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -1,5 +1,6 @@
 # makefile for libpng on BeOS x86 ELF with gcc
 # modified from makefile.linux by Sander Stoks
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1999 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
 # For conditions of distribution and use, see copyright notice in png.h
@@ -10,10 +11,10 @@ CC=gcc
 ZLIBLIB=/usr/local/lib
 ZLIBINC=/usr/local/include

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 0.  You should not
 # have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
 PNGVER = $(PNGMAJ).$(PNGMIN)

 ALIGN=
@@ -29,15 +30,29 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 CFLAGS=-I$(ZLIBINC) -Wall -O1 -funroll-loops \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 # LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
-LDFLAGS=-L. -Wl,-soname=libpng.so.$(PNGMAJ) -L$(ZLIBLIB) -lz -lm
+LDFLAGS=-L. -Wl,-soname=$(LIBNAME).so.$(PNGMAJ) -L$(ZLIBLIB) -lz -lm

 RANLIB=ranlib
 #RANLIB=echo

-# where make install puts libpng.a, libpng.so*, and png.h
+# where make install puts libpng.a, libpng12.so*, and png.h
 prefix=/usr/local
 INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=
+
+LIBNAME=libpng12

 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
@@ -47,42 +62,111 @@ OBJSDLL = $(OBJS)

 .SUFFIXES:      .c .o

-all: libpng.a libpng.so pngtest
+all: libpng.a $(LIBNAME).so pngtest

 libpng.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@

-libpng.so: libpng.so.$(PNGMAJ)
-	ln -sf libpng.so.$(PNGMAJ) libpng.so
-	cp libpng.so* /boot/home/config/lib
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc

-libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
-	ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"\"; \
+	echo ldflags=\"-Wl,-soname=$(LIBNAME).so.$(PNGMAJ)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

-libpng.so.$(PNGVER): $(OBJSDLL)
-	$(CC) -L$(ZLIBLIB) -lz -nostart -Wl,-soname,libpng.so.$(PNGMAJ) -o
-libpng.so.$(PNGVER) \
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so
+	cp $(LIBNAME).so* /boot/home/config/lib
+
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)
+
+$(LIBNAME).so.$(PNGVER): $(OBJSDLL)
+	$(CC) -L$(ZLIBLIB) -lz -nostart -Wl,-soname,$(LIBNAME).so.$(PNGMAJ) -o
+$(LIBNAME).so.$(PNGVER) \
 	 $(OBJSDLL)

-pngtest: pngtest.o libpng.so
-	$(CC) -L$(ZLIBLIB) -lz -lpng -o pngtest pngtest.o
+pngtest: pngtest.o $(LIBNAME).so
+	$(CC) -L$(ZLIBLIB) -lz -lpng12 -o pngtest pngtest.o

 test: pngtest
 	./pngtest

-install: libpng.a libpng.so.$(PNGVER)
-	-@mkdir $(INCPATH) $(LIBPATH)
-	cp png.h pngconf.h $(INCPATH)
-	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
-	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
-	chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
-	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
-	(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
-	 ln -sf libpng.so.$(PNGMAJ) libpng.so)
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -sf $(LIBNAME) libpng; ln -sf $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
-	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+	/bin/rm -f *.o libpng.a $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)* \
+	pngtest pngout.png

 # DO NOT DELETE THIS LINE -- make depend depends on it.

--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -8,17 +8,50 @@
 # Copyright (C) 1996, 1997 Andreas Dilger
 # For conditions of distribution and use, see copyright notice in png.h

+# this makefile intends to support building outside the src directory
+# if desired. when invoking it, specify an argument to SRCDIR on the
+# command line that points to the top of the directory where your source
+# is located.
+
+ifdef SRCDIR
+VPATH = $(SRCDIR)
+else
+SRCDIR = .
+endif
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+
+DESTDIR=
+
+# cosmetic: shortened strings:
+S =$(SRCDIR)
+D =$(DESTDIR)
+
 # To enable assembler optimizations, add '-DPNG_USE_PNGGCCRD' to
 # $CFLAGS, and include pnggccrd.o in $OBJS, below.

 CC=gcc
+ifdef MINGW
+MINGW_CCFLAGS=-mno-cygwin -I/usr/include/mingw
+MINGW_LDFLAGS=-mno-cygwin -L/usr/lib/mingw
+endif

 # where "make install" puts libpng.a, libpng.so*, png.h, and pngconf.h
+ifndef prefix
 prefix=/usr
+$(warning You haven't specified a 'prefix=' location. Defaulting to "/usr")
+endif

 # Where the zlib library and include files are located
-ZLIBLIB=${prefix}/lib
-ZLIBINC=${prefix}/include
+ZLIBLIB= /usr/lib
+ZLIBINC=
 #ZLIBLIB=../zlib
 #ZLIBINC=../zlib

@@ -30,17 +63,25 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion

-#CFLAGS=-DPNG_USE_PNGGCCRD -I$(ZLIBINC) -Wall -O3 $(ALIGN) -funroll-loops \
-#        -fomit-frame-pointer  # $(WARNMORE) -g -DPNG_DEBUG=5
-CFLAGS=-I$(ZLIBINC) -Wall -O3 $(ALIGN) -funroll-loops \
-	-fomit-frame-pointer
+### if you use the asm, add pnggccrd.o to the OBJS list
+###
+### if you don't need thread safety, but want the asm accel
+#CFLAGS= $(strip $(MINGW_CCFLAGS) -DPNG_THREAD_UNSAFE_OK -DPNG_USE_PNGGCCRD \
+#	$(addprefix -I,$(ZLIBINC)) -Wall -O3 $(ALIGN) -funroll-loops \
+#	-fomit-frame-pointer)  # $(WARNMORE) -g -DPNG_DEBUG=5
+### if you need thread safety and want (minimal) asm accel
+#CFLAGS= $(strip $(MINGW_CCFLAGS) -DPNG_USE_PNGGCCRD $(addprefix -I,$(ZLIBINC)) \
+#	-Wall -O3 $(ALIGN) -funroll-loops \
+#	-fomit-frame-pointer)  # $(WARNMORE) -g -DPNG_DEBUG=5
+### Normal (non-asm) compilation
+CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
+        -Wall -O3 $(ALIGN) -funroll-loops \
+	-fomit-frame-pointer) # $(WARNMORE) -g -DPNG_DEBUG=5

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
-# have to change it.
-PNGMAJ = 3
-#PNGDLL = $3
-PNGMIN = 1.2.1beta4
-PNGMIN_BASE = 1.2.1
+LIBNAME = libpng12
+PNGMAJ = 0
+PNGDLL = 12
+PNGMIN = 1.2.3rc6
 PNGVER = $(PNGMAJ).$(PNGMIN)

 SHAREDLIB=cygpng$(PNGDLL).dll
@@ -50,19 +91,21 @@ SHAREDDEF=libpng.def
 LIBS=$(SHAREDLIB) $(STATLIB)
 EXE=.exe

-LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz
-LDSHARED=gcc -shared -Wl,--enable-auto-image-base
-LDEXTRA=-Wl,--out-implib=$(IMPLIB) $(SHAREDDEF)
+LDFLAGS=$(strip -L. $(MINGW_LDFLAGS) -lpng $(addprefix -L,$(ZLIBLIB)) -lz)
+LDSFLAGS=$(strip -shared -L.  $(MINGW_LDFLAGS) -Wl,--export-all)
+LDEXTRA=-Wl,--out-implib=$(IMPLIB) $(addprefix -L,$(ZLIBLIB)) -lz

+MKDIR=/bin/mkdir -pv
 RANLIB=ranlib
 #RANLIB=echo

 INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib
+
 BINPATH=$(prefix)/bin
 MANPATH=$(prefix)/man
 MAN3PATH=$(MANPATH)/man3
-DOCPATH=$(prefix)/doc/libpng-$(PNGMIN_BASE)
+MAN5PATH=$(MANPATH)/man5

 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
@@ -70,37 +113,59 @@ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \

 OBJSDLL = $(OBJS:.o=.pic.o)

-.SUFFIXES:      .c .o .pic.o
+.SUFFIXES: .c .o .pic.o

 %.o : %.c
-	$(CC) -c $(CFLAGS) -DPNG_STATIC -DZLIB_STATIC -o $@ $<
-
+	$(CC) -c $(CFLAGS) -o $@ $<
+%.pic.o : CFLAGS += -DPNG_BUILD_DLL
 %.pic.o : %.c
-	$(CC) -c $(CFLAGS) -DPNG_BUILD_DLL -o $@ $<
+	$(CC) -c $(CFLAGS) -o $@ $<

-all: all-static all-shared
+all: all-static all-shared libpng.pc libpng-config
+
+# make this to verify that "make [...] install" will do what you want.
+buildsetup-tell:
+	@echo  VPATH is set to: \"$(VPATH)\"
+	@echo  prefix is set to: \"$(prefix)\"
+	@echo -e INCPATH,LIBPATH, etc. are set to:'\n' \
+ $(addprefix $(D),$(INCPATH)'\n' $(LIBPATH)'\n' $(BINPATH)'\n' \
+   $(MANPATH)'\n' $(MAN3PATH)'\n' $(MAN5PATH)'\n')'\n'
+
+libpng.pc: scripts/libpng.pc.in
+	@echo -e Making pkg-config file for this libpng installation..'\n' \
+           using PREFIX=\"$(prefix)\"'\n'
+	cat $(S)/scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc
+
+libpng-config: scripts/libpng-config.in
+	@echo -e Making $(LIBNAME) libpng-config file for this libpng \
+ installation..'\n' using PREFIX=\"$(prefix)\"'\n'
+	( cat $(S)/scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"\"; \
+	echo ldflags=\"-L$(LIBPATH)\"; \
+	echo libs=\"-lpng$(PNGDLL) -lz\"; \
+	cat $(S)/scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

 static: all-static
-
 shared: all-shared
-
 all-static: $(STATLIB) pngtest-stat$(EXE)
-
 all-shared: $(SHAREDLIB) pngtest$(EXE)

-pnggccrd.o:	png.h pngconf.h
+pnggccrd.o: pnggccrd.c png.h pngconf.h
 	@echo ""
 	@echo '    You can ignore the single "control reaches end of non-void function"'
 	@echo '    warning and multiple "<variable> defined but not used" warnings:'
 	@echo ""
-	$(CC) -c $(CFLAGS) -DPNG_STATIC -DZLIB_STATIC -o $@ $*.c
+	$(CC) -c $(CFLAGS) -o $@ $<

-pnggccrd.pic.o:	png.h pngconf.h
+pnggccrd.pic.o:	pnggccrd.c png.h pngconf.h
 	@echo ""
 	@echo '    You can ignore the single "control reaches end of non-void function"'
 	@echo '    warning and multiple "<variable> defined but not used" warnings:'
 	@echo ""
-	$(CC) -c $(CFLAGS) -DPNG_BUILD_DLL -o $@ pnggccrd.c
+	$(CC) -c $(CFLAGS) -DPNG_BUILD_DLL -o $@ $<

 $(STATLIB): $(OBJS)
 	ar rc $@ $(OBJS)
@@ -111,7 +176,7 @@ $(SHAREDDEF): projects/msvc/png32ms.def
 	sed -e 's/\([^;]*\);/;/' > $@

 $(SHAREDLIB): $(OBJSDLL) $(SHAREDDEF)
-	$(LDSHARED) -o $@ $(LDEXTRA) $(OBJSDLL) -L. -L$(ZLIBLIB) -lz
+	$(CC) $(LDSFLAGS) -o $@ $(OBJSDLL) -L. $(LDEXTRA)

 pngtest$(EXE): pngtest.pic.o $(SHAREDLIB)
 	$(CC) $(CFLAGS) $< $(LDFLAGS) -o $@
@@ -123,48 +188,90 @@ pngtest.pic.o: pngtest.c
 	$(CC) $(CFLAGS) -c $< -o $@

 pngtest.o: pngtest.c
-	$(CC) $(CFLAGS) -DPNG_STATIC -DZLIB_STATIC -c $< -o $@
+	$(CC) $(CFLAGS) -c $< -o $@

 test: test-static test-shared

 test-static: pngtest-stat$(EXE)
-	./pngtest-stat
+	./pngtest-stat $(S)/pngtest.png

 test-shared: pngtest$(EXE)
-	./pngtest
+	./pngtest $(S)/pngtest.png

-install: install-static install-shared
+install-static: $(STATLIB) install-headers install-man
+	-@if [ ! -d $(D)$(LIBPATH) ]; then $(MKDIR) $(D)$(LIBPATH); fi
+	install -m 644 $(STATLIB) $(D)$(LIBPATH)/$(LIBNAME).a
+	-@rm -f $(D)$(LIBPATH)/$(STATLIB)
+	(cd $(D)$(LIBPATH); ln -sf $(LIBNAME).a $(STATLIB))

-install-static: $(STATLIB) install-headers install-docs install-man
-	-@if [ ! -d $(LIBPATH) ]; then mkdir -p $(LIBPATH); fi
-	install -m 755 $(STATLIB) $(LIBPATH)
-
-install-shared: $(SHAREDLIB) install-headers install-docs install-man
-	-@if [ ! -d $(LIBPATH) ]; then mkdir -p $(LIBPATH); fi
-	-@if [ ! -d $(BINPATH) ]; then mkdir -p $(BINPATH); fi
-	install -m 755 $(IMPLIB) $(LIBPATH)
-	install -s -m 755 $(SHAREDLIB) $(BINPATH)
+install-shared: $(SHAREDLIB) libpng.pc libpng-config install-headers install-man
+	-@if [ ! -d $(D)$(LIBPATH) ]; then $(MKDIR) $(D)$(LIBPATH); fi
+	-@if [ ! -d $(D)$(BINPATH) ]; then $(MKDIR) $(D)$(BINPATH); fi
+	-@if [ ! -d $(D)$(LIBPATH)/pkgconfig ]; then \
+           $(MKDIR) $(D)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(D)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(D)$(LIBPATH)/pkgconfig/libpng.pc
+	install -m 644 $(IMPLIB) $(D)$(LIBPATH)/$(LIBNAME).dll.a
+	-@rm -f $(D)$(LIBPATH)/$(IMPLIB)
+	(cd $(D)$(LIBPATH); ln -sf $(LIBNAME).dll.a $(IMPLIB))
+	install -s -m 755 $(SHAREDLIB) $(D)$(BINPATH)
+	install -m 644 libpng.pc $(D)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(D)$(LIBPATH)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)

 install-headers:
-	-@if [ ! -d $(INCPATH)  ]; then mkdir -p $(INCPATH); fi
-	install -m 644 png.h pngconf.h $(INCPATH)
-
-install-docs:
-	-@if [ ! -d $(DOCPATH) ]; then mkdir -p $(DOCPATH); fi
-	install -m 644 $(DOCS) $(DOCPATH)
+	-@if [ ! -d $(D)$(INCPATH) ]; then \
+          $(MKDIR) $(D)$(INCPATH); fi
+	-@if [ ! -d $(D)$(INCPATH)/$(LIBNAME) ]; then \
+          $(MKDIR) $(D)$(INCPATH)/$(LIBNAME); fi
+	-@rm -f $(D)$(INCPATH)/png.h
+	-@rm -f $(D)$(INCPATH)/pngconf.h
+	install -m 644 $(S)/png.h $(S)/pngconf.h $(D)$(INCPATH)/$(LIBNAME)
+	-@rm -f $(D)$(INCPATH)/libpng
+	(cd $(D)$(INCPATH); ln -sf $(LIBNAME) libpng; ln -sf $(LIBNAME)/* .)

 install-man:
-	-@if [ ! -d $(MAN3PATH) ]; then mkdir -p $(MAN3PATH); fi
-	install -m 644 libpngpf.3 libpng.3 $(MAN3PATH)
+	-@if [ ! -d $(D)$(MAN3PATH) ]; then \
+          $(MKDIR) $(D)$(MAN3PATH); fi
+	-@if [ ! -d $(D)$(MAN5PATH) ]; then \
+          $(MKDIR) $(D)$(MAN5PATH); fi
+	install -m 644 $(S)/libpngpf.3 $(S)/libpng.3 $(D)$(MAN3PATH)
+	install -m 644 $(S)/png.5 $(D)$(MAN5PATH)
+
+install-config: libpng-config
+	-@if [ ! -d $(D)$(BINPATH) ]; then \
+           mkdir $(D)$(BINPATH); fi
+	-@/bin/rm -f $(D)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(D)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(D)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(D)$(BINPATH)/$(LIBNAME)-config
+	(cd $(D)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+# run this to verify that a future `configure' run will pick up the settings
+# you want.
+test-config-install: SHELL=/bin/bash
+test-config-install: $(D)$(BINPATH)/libpng-config
+	@echo -e Testing libpng-config functions...'\n'
+	@ for TYRA in LDFLAGS CPPFLAGS CFLAGS LIBS VERSION; \
+   do \
+    printf "(%d)\t %s = %s\n" $$(($$gytiu + 1)) $$TYRA \
+    "$$($(D)$(BINPATH)/libpng-config `echo --$$TYRA |tr '[:upper:]' '[:lower:]'`)"; \
+    gytiu=$$(( $$gytiu + 1 )); \
+   done
+
+
+install: install-static install-shared install-man install-config

 clean:
 	/bin/rm -f *.pic.o *.o $(STATLIB) $(IMPLIB) $(SHAREDLIB) \
-	pngtest-stat$(EXE) pngtest$(EXE) pngout.png $(SHAREDDEF)
+	pngtest-stat$(EXE) pngtest$(EXE) pngout.png $(SHAREDDEF) \
+	libpng-config libpng.pc

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
 	chmod a-w *.[ch35] $(DOCS) scripts/*

+.PHONY: buildsetup-tell libpng.pc libpng-config test-config-install clean
+
 # DO NOT DELETE THIS LINE -- make depend depends on it.

 png.o png.pic.o:		png.h pngconf.h png.c
@@ -185,3 +292,8 @@ pngpread.o pngpread.pic.o:	png.h pngconf.h pngpread.c

 pngtest.o:			png.h pngconf.h pngtest.c
 pngtest-stat.o:			png.h pngconf.h pngtest.c
+
+
+
+
+
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -1,11 +1,12 @@
 # makefile for libpng on Darwin / Mac OS X
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 2001 Christoph Pfisterer
 # derived from makefile.linux:
 #  Copyright (C) 1998, 1999 Greg Roelofs
 #  Copyright (C) 1996, 1997 Andreas Dilger
 # For conditions of distribution and use, see copyright notice in png.h

-# where "make install" puts libpng.a, libpng.dylib, png.h and pngconf.h
+# where "make install" puts libpng.a, libpng12.dylib, png.h and pngconf.h
 prefix=/usr/local

 # Where the zlib library and include files are located
@@ -21,14 +22,27 @@ LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz
 #RANLIB=echo
 RANLIB=ranlib

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 0.  You should not
 # have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
 PNGVER = $(PNGMAJ).$(PNGMIN)
+LIBNAME = libpng12

 INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
@@ -41,45 +55,112 @@ OBJSDLL = $(OBJS:.o=.pic.o)
 .c.pic.o:
 	$(CC) -c $(CFLAGS) -fno-common -o $@ $*.c

-all: libpng.a libpng.dylib pngtest
+all: libpng.a $(LIBNAME).dylib pngtest

 libpng.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@

-libpng.dylib: libpng.$(PNGMAJ).dylib
-	ln -sf libpng.$(PNGMAJ).dylib libpng.dylib
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! | \
+	   sed -e s/-lm// > libpng.pc

-libpng.$(PNGMAJ).dylib: libpng.$(PNGVER).dylib
-	ln -sf libpng.$(PNGVER).dylib libpng.$(PNGMAJ).dylib
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"\"; \
+	echo ldflags=\"-L$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

-libpng.$(PNGVER).dylib: $(OBJSDLL)
-	$(CC) -dynamiclib -undefined suppress \
-	 -install_name $(LIBPATH)/libpng.$(PNGMAJ).dylib \
+$(LIBNAME).dylib: $(LIBNAME).$(PNGMAJ).dylib
+	ln -sf $(LIBNAME).$(PNGMAJ).dylib $(LIBNAME).dylib
+
+$(LIBNAME).$(PNGMAJ).dylib: $(LIBNAME).$(PNGVER).dylib
+	ln -sf $(LIBNAME).$(PNGVER).dylib $(LIBNAME).$(PNGMAJ).dylib
+
+$(LIBNAME).$(PNGVER).dylib: $(OBJSDLL)
+	$(CC) -dynamiclib \
+	 -install_name $(DESTDIR)$(LIBPATH)/$(LIBNAME).$(PNGMAJ).dylib \
 	 -current_version $(PNGMIN) -compatibility_version $(PNGMIN) \
-	 -o libpng.$(PNGVER).dylib \
+	 -o $(LIBNAME).$(PNGVER).dylib \
 	 $(OBJSDLL) -L$(ZLIBLIB) -lz

-pngtest: pngtest.o libpng.dylib
+pngtest: pngtest.o $(LIBNAME).dylib
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)

 test: pngtest
 	./pngtest

-install: libpng.a libpng.dylib
-	-@if [ ! -d $(INCPATH)  ]; then mkdir $(INCPATH); fi
-	-@if [ ! -d $(LIBPATH) ]; then mkdir $(LIBPATH); fi
-	cp png.h pngconf.h $(INCPATH)
-	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
-	cp libpng.a libpng.$(PNGVER).dylib $(LIBPATH)
-	chmod 755 $(LIBPATH)/libpng.$(PNGVER).dylib
-	ranlib $(LIBPATH)/libpng.a
-	-@/bin/rm -f $(LIBPATH)/libpng.$(PNGMAJ).dylib $(LIBPATH)/libpng.dylib
-	(cd $(LIBPATH); ln -sf libpng.$(PNGVER).dylib libpng.$(PNGMAJ).dylib; \
-	 ln -sf libpng.$(PNGMAJ).dylib libpng.dylib)
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -sf $(LIBNAME) libpng; ln -sf $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).dylib libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).$(PNGMAJ)*.dylib
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).dylib
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.dylib
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.3.dylib
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.3.*.dylib
+	cp $(LIBNAME).$(PNGVER).dylib $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).$(PNGVER).dylib
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -sf $(LIBNAME).$(PNGVER).dylib libpng.dylib; \
+	ln -sf $(LIBNAME).$(PNGVER).dylib libpng.3.dylib; \
+	ln -sf $(LIBNAME).$(PNGVER).dylib libpng.3.$(PNGMIN).dylib; \
+	ln -sf $(LIBNAME).$(PNGVER).dylib $(LIBNAME).$(PNGMAJ).dylib; \
+	ln -sf $(LIBNAME).$(PNGMAJ).dylib $(LIBNAME).dylib)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
-	rm -f *.o libpng.a libpng.*dylib pngtest pngout.png
+	rm -f *.o libpng.a $(LIBNAME).*dylib pngtest pngout.png

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -1,5 +1,5 @@
 # makefile for libpng on DEC Alpha Unix
-# Copyright (C) 2000 Glenn Randers-Pehrson
+# Copyright (C) 2000-2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h

@@ -7,6 +7,18 @@
 prefix=/usr/local
 INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 # Where the zlib library and include files are located
 #ZLIBLIB=/usr/local/lib
@@ -14,11 +26,12 @@ LIBPATH=$(prefix)/lib
 ZLIBLIB=../zlib
 ZLIBINC=../zlib

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 0.  You should not
 # have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
 PNGVER = $(PNGMAJ).$(PNGMIN)
+LIBNAME = libpng12

 CC=cc
 CFLAGS=-std -w1 -I$(ZLIBINC) -O # -g -DPNG_DEBUG=1
@@ -31,19 +44,32 @@ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
 	pngwtran.o pngmem.o pngerror.o pngpread.o

-all: libpng.so libpng.a pngtest
+all: $(LIBNAME).so libpng.a pngtest

 libpng.a: $(OBJS)
 	ar rc $@  $(OBJS)
 	$(RANLIB) $@

-libpng.so: libpng.so.$(PNGMAJ)
-	ln -f -s libpng.so.$(PNGMAJ) libpng.so
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc

-libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
-	ln -f -s libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"-std\"; \
+	echo ldflags=\"-L$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

-libpng.so.$(PNGVER): $(OBJS)
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so
+
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)
+
+$(LIBNAME).so.$(PNGVER): $(OBJS)
 	$(CC) -shared -o $@ $(OBJS) -L$(ZLIBLIB) -lz -lm

 pngtest: pngtest.o libpng.a
@@ -52,23 +78,73 @@ pngtest: pngtest.o libpng.a
 test: pngtest
 	./pngtest

-install: libpng.a libpng.so.$(PNGVER)
-	-@mkdir $(INCPATH)
-	-@mkdir $(LIBPATH)
-	cp png.h $(INCPATH)
-	cp pngconf.h $(INCPATH)
-	chmod 644 $(INCPATH)/png.h
-	chmod 644 $(INCPATH)/pngconf.h
-	cp libpng.a $(LIBPATH)
-	cp libpng.so.$(PNGVER) $(LIBPATH)
-	chmod 644 $(LIBPATH)/libpng.a
-	chmod 644 $(LIBPATH)/libpng.so.$(PNGVER)
-	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
-	(cd $(LIBPATH); ln -f -s libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
-	 ln -f -s libpng.so.$(PNGMAJ) libpng.so)
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -sf $(LIBNAME) libpng; ln -sf $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
-	rm -f *.o libpng.a pngtest pngout.png libpng.so*
+	/bin/rm -f *.o libpng.a $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)* pngtest pngout.png

 # DO NOT DELETE THIS LINE -- make depend depends on it.

--- a/scripts/makefile.dj2
+++ b/scripts/makefile.dj2
@@ -1,10 +1,13 @@
 # DJGPP (DOS gcc) makefile for libpng
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h

-# where make install puts libpng.a and png.h
+# where make install will put libpng.a and png.h
 #prefix=/usr/local
 prefix=.
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib

 CC=gcc
 CFLAGS=-I../zlib -O
--- a/scripts/makefile.freebsd
+++ b/scripts/makefile.freebsd
@@ -0,0 +1,107 @@
+# makefile for libpng under FreeBSD
+# Copyright (C) 2002 Glenn Randers-Pehrson and Andrey A. Chernov
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+# For conditions of distribution and use, see copyright notice in png.h
+
+.include <bsd.own.mk>
+
+# where make install puts libpng.a and png.h
+prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=
+
+PNGMAJ= 5
+.if (${OBJFORMAT} == "elf")
+PNGVER= $(PNGMAJ)
+.else
+PNGMIN= 0
+PNGVER= $(PNGMAJ).$(PNGMIN)
+.endif
+
+CFLAGS+= -I. -DPNG_USE_PNGGCCRD
+.if (${MACHINE_ARCH} != "i386")
+CFLAGS+= -DPNG_NO_ASSEMBLER_CODE
+.endif
+LDFLAGS+=-L. -lpng -lz -lm -static
+
+OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
+	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
+	pngwtran.o pngmem.o pngerror.o pngpread.o pnggccrd.o
+
+.SUFFIXES: .c .so .o
+
+.c.so:
+	${CC} ${CFLAGS} -fPIC -DPIC -o $@ -c $<
+
+all: libpng.a libpng.so.${PNGVER} pngtest
+
+libpng.a: $(OBJS)
+	ar rc $@  $(OBJS)
+	$(RANLIB) $@
+
+libpng.so.${PNGVER}: $(OBJS:S/o$/so/g)
+.if (${OBJFORMAT} == "elf")
+	${CC} -shared -Wl,-x,-soname,$@ -o $@ $(OBJS:S/o$/so/g) -lz -lm
+.else
+	${CC} -shared -Wl,-x -o $@ $(OBJS:S/o$/so/g) -lz -lm
+.endif
+
+pngtest: pngtest.o libpng.a
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+	./pngtest
+
+install: libpng.a libpng.so.${PNGVER}
+	-@mkdir $(DESTDIR)$(INCPATH)/libpng
+	${INSTALL} -o ${INCOWN} -g ${INCGRP} -m ${INCMODE} \
+		png.h pngconf.h $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); rm -f png.h pngconf.h; ln -sf libpng/*.h .)
+	${INSTALL} -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
+		libpng.a libpng.so.${PNGVER} $(DESTDIR)$(LIBPATH)
+	$(RANLIB) $(DESTDIR)$(LIBPATH)/libpng.a
+	ln -sf libpng.so.${PNGVER} $(DESTDIR)$(LIBPATH)/libpng.so
+	/sbin/ldconfig -R
+	${INSTALL} -o ${MANOWN} -g ${MANGRP} -m ${MANMODE} \
+		libpng.3 libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	${INSTALL} -o ${MANOWN} -g ${MANGRP} -m ${MANMODE} \
+		png.5 $(DESTDIR)$(MANPATH)/man5
+
+clean:
+	rm -f *.o *.so libpng.a libpng.so.${PNGVER} pngtest pngout.png
+
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+	chmod a-w *.[ch35] $(DOCS) scripts/*
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o: png.h pngconf.h
+pngerror.o: png.h pngconf.h
+pngrio.o: png.h pngconf.h
+pngwio.o: png.h pngconf.h
+pngmem.o: png.h pngconf.h
+pngset.o: png.h pngconf.h
+pngget.o: png.h pngconf.h
+pngread.o: png.h pngconf.h
+pngrtran.o: png.h pngconf.h
+pngrutil.o: png.h pngconf.h
+pngtest.o: png.h pngconf.h
+pngtrans.o: png.h pngconf.h
+pngwrite.o: png.h pngconf.h
+pngwtran.o: png.h pngconf.h
+pngwutil.o: png.h pngconf.h
+pngpread.o: png.h pngconf.h
+pnggccrd.o: png.h pngconf.h
+
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -1,6 +1,8 @@
-# makefile for libpng on Linux ELF with gcc using MMX assembler code
-# Copyright 1996-1997 Andreas Dilger
+# makefile for libpng.a and libpng12.so on Linux ELF with gcc using MMX
+# assembler code
+# Copyright 2002 Greg Roelofs and Glenn Randers-Pehrson
 # Copyright 1998-2001 Greg Roelofs
+# Copyright 1996-1997 Andreas Dilger
 # For conditions of distribution and use, see copyright notice in png.h

 # CAUTION: Do not use this makefile with gcc versions 2.7.2.2 and earlier.
@@ -11,9 +13,15 @@
 #        there are no floating-point programs (e.g., SETI@Home) running in
 #        the background!  Context switches between MMX and FPU are expensive.

+LIBNAME = libpng12
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
 CC=gcc

-# where "make install" puts libpng.a, libpng.so*, png.h, and pngconf.h
+# where "make install" puts libpng.a, libpng12/libpng12.so*,
+# $(LIBNAME)/png.h and $(LIBNAME)/pngconf.h
 prefix=/usr/local

 # Where the zlib library and include files are located
@@ -35,7 +43,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 # Remove -DPNG_THREAD_UNSAFE_OK if you need thread safety
 ### for generic gcc:
 CFLAGS=-DPNG_THREAD_UNSAFE_OK -DPNG_USE_PNGGCCRD -I$(ZLIBINC) -Wall \
-       	-O3 $(ALIGN) -funroll-loops \
+	-O3 $(ALIGN) -funroll-loops \
 	-fomit-frame-pointer  # $(WARNMORE) -g -DPNG_DEBUG=5
 ### for gcc 2.95.2 on 686:
 #CFLAGS=-DPNG_THREAD_UNSAFE_OK -DPNG_USE_PNGGCCRD -I$(ZLIBINC) -Wall -O3 \
@@ -46,20 +54,26 @@ CFLAGS=-DPNG_THREAD_UNSAFE_OK -DPNG_USE_PNGGCCRD -I$(ZLIBINC) -Wall \
 #	-m486 -malign-double -ffast-math \
 #	$(ALIGN) -funroll-loops -funroll-all-loops -fomit-frame-pointer 

-LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
+LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng12 -lz -lm
 LDFLAGS_A=-L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) libpng.a -lz -lm

 RANLIB=ranlib
 #RANLIB=echo

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
-# have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
-PNGVER = $(PNGMAJ).$(PNGMIN)
-
 INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
@@ -72,7 +86,21 @@ OBJSDLL = $(OBJS:.o=.pic.o)
 .c.pic.o:
 	$(CC) -c $(CFLAGS) -fPIC -o $@ $*.c

-all: libpng.a libpng.so pngtest pngtest-static
+all: libpng.a $(LIBNAME).so pngtest pngtest-static
+
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc
+
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME) -DPNG_THREAD_UNSAFE_OK \
+	   -DPNG_USE_PNGGCCRD"; \
+	echo cflags=\"\"; \
+	echo ldflags=\"\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

 pnggccrd.o:	pnggccrd.c png.h pngconf.h
 	$(CC) -c $(CFLAGS) -o $@ $*.c
@@ -84,17 +112,17 @@ libpng.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@

-libpng.so: libpng.so.$(PNGMAJ)
-	ln -sf libpng.so.$(PNGMAJ) libpng.so
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so

-libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
-	ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)

-libpng.so.$(PNGVER): $(OBJSDLL)
-	$(CC) -shared -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
+$(LIBNAME).so.$(PNGVER): $(OBJSDLL)
+	$(CC) -shared -Wl,-soname,$(LIBNAME).so.$(PNGMAJ) -o $(LIBNAME).so.$(PNGVER) \
 	 $(OBJSDLL) -L$(ZLIBLIB) -lz -lm -lc

-pngtest: pngtest.o libpng.so
+pngtest: pngtest.o $(LIBNAME).so
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)

 pngtest-static: pngtest.o libpng.a
@@ -102,27 +130,82 @@ pngtest-static: pngtest.o libpng.a

 test: pngtest pngtest-static
 	@echo ""
-	@echo "   Testing dynamically linked version:"
+	@echo "   Running pngtest dynamically linked with $(LIBNAME).so:"
 	@echo ""
 	./pngtest
 	@echo ""
-	@echo "   Testing statically linked version:"
+	@echo "   Running pngtest statically linked with libpng.a:"
 	@echo ""
 	./pngtest-static

-install: libpng.a libpng.so.$(PNGVER)
-	-@if [ ! -d $(INCPATH)  ]; then mkdir $(INCPATH); fi
-	-@if [ ! -d $(LIBPATH) ]; then mkdir $(LIBPATH); fi
-	cp png.h pngconf.h $(INCPATH)
-	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
-	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
-	chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
-	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
-	(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
-	 ln -sf libpng.so.$(PNGMAJ) libpng.so)
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -sf $(LIBNAME) libpng; ln -sf $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
-	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+	/bin/rm -f *.o libpng.a $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)* \
+	pngtest pngout.png

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -1,4 +1,5 @@
 # makefile for libpng on HP-UX using GCC
+# Copyright (C) 2002, Glenn Randers-Pehrson
 # Copyright (C) 2001, Laurent faillie
 # Copyright (C) 1998, 1999 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
@@ -31,14 +32,27 @@ LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 RANLIB=ranlib
 #RANLIB=echo

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 0.  You should not
 # have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
 PNGVER = $(PNGMAJ).$(PNGMIN)
+LIBNAME = libpng12

 INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
@@ -51,41 +65,111 @@ OBJSDLL = $(OBJS:.o=.pic.o)
 .c.pic.o:
 	$(CC) -c $(CFLAGS) -fPIC -o $@ $*.c

-all: libpng.a libpng.sl pngtest
+all: libpng.a $(LIBNAME).sl pngtest

 libpng.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@

-libpng.sl: libpng.sl.$(PNGMAJ)
-	ln -f -s libpng.sl.$(PNGMAJ) libpng.sl
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc

-libpng.sl.$(PNGMAJ): libpng.sl.$(PNGVER)
-	ln -f -s libpng.sl.$(PNGVER) libpng.sl.$(PNGMAJ)
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"\"; \
+	echo ldflags=\"\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

-libpng.sl.$(PNGVER): $(OBJSDLL)
+$(LIBNAME).sl: $(LIBNAME).sl.$(PNGMAJ)
+	ln -f -s $(LIBNAME).sl.$(PNGMAJ) $(LIBNAME).sl
+
+$(LIBNAME).sl.$(PNGMAJ): $(LIBNAME).sl.$(PNGVER)
+	ln -f -s $(LIBNAME).sl.$(PNGVER) $(LIBNAME).sl.$(PNGMAJ)
+
+$(LIBNAME).sl.$(PNGVER): $(OBJSDLL)
 	$(LD) -b -L$(ZLIBLIB) +s +b $(ZLIBLIB) \
 	+h libpng.sl.$(PNGMAJ) -o libpng.sl.$(PNGVER) $(OBJSDLL) -lz

-pngtest: pngtest.o libpng.sl
+pngtest: pngtest.o $(LIBNAME).sl
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)

 test: pngtest
 	./pngtest

-install: libpng.a libpng.sl.$(PNGVER)
-	-@if [ ! -d $(INCPATH)  ]; then mkdir $(INCPATH); fi
-	-@if [ ! -d $(LIBPATH) ]; then mkdir $(LIBPATH); fi
-	cp png.h pngconf.h $(INCPATH)
-	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
-	cp libpng.a libpng.sl.$(PNGVER) $(LIBPATH)
-	chmod 755 $(LIBPATH)/libpng.sl.$(PNGVER)
-	-@/bin/rm -f $(LIBPATH)/libpng.sl.$(PNGMAJ) $(LIBPATH)/libpng.sl
-	(cd $(LIBPATH); ln -sf libpng.sl.$(PNGVER) libpng.sl.$(PNGMAJ); \
-	 ln -sf libpng.sl.$(PNGMAJ) libpng.sl)
+
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then \
+	mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -sf $(LIBNAME) libpng; ln -sf $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).sl.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).sl.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).sl
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).sl.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).sl.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -sf $(LIBNAME).sl.$(PNGVER) libpng.sl.3; \
+	ln -sf $(LIBNAME).sl.$(PNGVER) libpng.sl.3.$(PNGMIN); \
+	ln -sf $(LIBNAME).sl.$(PNGVER) $(LIBNAME).sl.$(PNGMAJ); \
+	ln -sf $(LIBNAME).sl.$(PNGMAJ) $(LIBNAME).sl)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then mkdir \
+	$(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
-	/bin/rm -f *.o libpng.a libpng.sl* pngtest pngout.png
+	/bin/rm -f *.o libpng.a $(SHAREDLIB).sl $(SHAREDLIB).sl.$(PNGMAJ)* \
+	pngtest pngout.png

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -1,5 +1,5 @@
 # makefile for libpng, HPUX (10.20 and 11.00)
-# Copyright (C) 1999, 2000 Glenn Randers-Pehrson
+# Copyright (C) 1999-2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42
 # contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
 # For conditions of distribution and use, see copyright notice in png.h
@@ -16,14 +16,29 @@ LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm

 RANLIB=ranlib

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 0.  You should not
 # have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
 PNGVER = $(PNGMAJ).$(PNGMIN)
+LIBNAME = libpng12

-# where make install puts libpng.a and png.h
+# where make install puts libpng.a, libpng12.sl, and png.h
 prefix=/opt/libpng
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
@@ -36,21 +51,35 @@ OBJSDLL = $(OBJS:.o=.pic.o)
 .c.pic.o:
 	$(CC) -c $(CFLAGS) +z -o $@ $*.c

-all: libpng.a libpng.sl pngtest
+all: libpng.a $(LIBNAME).sl pngtest

 libpng.a: $(OBJS)
 	ar rc $@  $(OBJS)
 	$(RANLIB) $@

-libpng.sl: libpng.sl.$(PNGMAJ)
-	ln -f -s libpng.sl.$(PNGMAJ) libpng.sl
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc

-libpng.sl.$(PNGMAJ): libpng.sl.$(PNGVER)
-	ln -f -s libpng.sl.$(PNGVER) libpng.sl.$(PNGMAJ)
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"-Ae +DA1.1 +DS2.0"; \
+	echo ldflags=\"-L$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

-libpng.sl.$(PNGVER): $(OBJSDLL)
+$(LIBNAME).sl: $(LIBNAME).sl.$(PNGMAJ)
+	ln -sf $(LIBNAME).sl.$(PNGMAJ) $(LIBNAME).sl
+
+$(LIBNAME).sl.$(PNGMAJ): $(LIBNAME).sl.$(PNGVER)
+	ln -sf $(LIBNAME).sl.$(PNGVER) $(LIBNAME).sl.$(PNGMAJ)
+
+$(LIBNAME).sl.$(PNGVER): $(OBJSDLL)
 	$(LD) -b -L$(ZLIBLIB) +s +b $(ZLIBLIB) \
-	+h libpng.sl.$(PNGMAJ) -o libpng.sl.$(PNGVER) $(OBJSDLL) -lz
+	+h $(LIBNAME).sl.$(PNGMAJ) -o $(LIBNAME).sl.$(PNGVER) \
+	$(OBJSDLL) -lz

 pngtest: pngtest.o libpng.a
 	$(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
@@ -58,21 +87,74 @@ pngtest: pngtest.o libpng.a
 test: pngtest
 	./pngtest

-install: libpng.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp png.h $(prefix)/include
-	cp pngconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/png.h
-	chmod 644 $(prefix)/include/pngconf.h
-	cp libpng.a libpng.sl.$(PNGVER) $(prefix)/lib
-	chmod 644 $(prefix)/lib/libpng.a
-	chmod 755 $(prefix)/lib/libpng.sl.$(PNGVER)
-	(cd $(prefix)/lib; ln -f -s libpng.sl.$(PNGVER) libpng.sl.$(PNGMAJ); \
-	ln -f -s libpng.sl.$(PNGMAJ) libpng.sl)
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -sf $(LIBNAME) libpng; ln -sf $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).sl.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).sl.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).sl
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.sl
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.sl.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.sl.3.*
+	cp $(LIBNAME).sl.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).sl.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -sf $(LIBNAME).sl.$(PNGVER) libpng.sl; \
+	ln -sf $(LIBNAME).sl.$(PNGVER) libpng.sl.3; \
+	ln -sf $(LIBNAME).sl.$(PNGVER) libpng.sl.3.$(PNGMIN); \
+	ln -sf $(LIBNAME).sl.$(PNGVER) $(LIBNAME).sl.$(PNGMAJ); \
+	ln -sf $(LIBNAME).sl.$(PNGMAJ) $(LIBNAME).sl)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
-	rm -f *.o libpng.a libpng.sl* pngtest pngout.png
+	/bin/rm -f *.o libpng.a $(LIBNAME).sl $(LIBNAME).sl.$(PNGMAJ)* \
+	pngtest pngout.png

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
--- a/scripts/makefile.knr
+++ b/scripts/makefile.knr
@@ -1,4 +1,5 @@
 # makefile for libpng
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h

@@ -9,6 +10,18 @@

 # where make install puts libpng.a and png.h
 prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 CC=cc
 CFLAGS=-I../zlib -O
@@ -46,14 +59,18 @@ test: pngtest
 	./pngtest

 install: libpng.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp png.h $(prefix)/include
-	cp pngconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/png.h
-	chmod 644 $(prefix)/include/pngconf.h
-	cp libpng.a $(prefix)/lib
-	chmod 644 $(prefix)/lib/libpng.a
+	-@mkdir $(DESTDIR)$(INCPATH)
+	-@mkdir $(DESTDIR)$(INCPATH)/libpng
+	-@mkdir $(DESTDIR)$(LIBPATH)
+	-@rm -f $(DESTDIR)$(INCPATH)/png.h
+	-@rm -f $(DESTDIR)$(INCPATH)/pngconf.h
+	cp png.h $(DESTDIR)$(INCPATH)/libpng
+	cp pngconf.h $(DESTDIR)$(INCPATH)/libpng
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/png.h
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/pngconf.h
+	(cd $(DESTDIR)$(INCPATH); ln -f -s libpng/* .)
+	cp libpng.a $(DESTDIR)$(LIBPATH)
+	chmod 644 $(DESTDIR)$(LIBPATH)/libpng.a

 clean:
 	rm -f *.o libpng.a pngtest pngout.png ansi2knr
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -1,11 +1,17 @@
-# makefile for libpng on Linux ELF with gcc
-# Copyright (C) 1998, 1999 Greg Roelofs
+# makefile for libpng.a and libpng12.so on Linux ELF with gcc
+# Copyright (C) 1998, 1999, 2002 Greg Roelofs and Glenn Randers-Pehrson
 # Copyright (C) 1996, 1997 Andreas Dilger
 # For conditions of distribution and use, see copyright notice in png.h

+LIBNAME = libpng12
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
 CC=gcc

-# where "make install" puts libpng.a, libpng.so*, png.h and pngconf.h
+# where "make install" puts libpng12.a, libpng12/libpng12.so*,
+# libpng12/png.h and libpng12/pngconf.h
 prefix=/usr/local

 # Where the zlib library and include files are located
@@ -26,19 +32,27 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \

 CFLAGS=-I$(ZLIBINC) -Wall -O3 -funroll-loops \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
-LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
+
+LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng12 -lz -lm
+LDFLAGS_A=-L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) libpng.a -lz -lm

 RANLIB=ranlib
 #RANLIB=echo

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
-# have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
-PNGVER = $(PNGMAJ).$(PNGMIN)
-
 INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
@@ -51,41 +65,120 @@ OBJSDLL = $(OBJS:.o=.pic.o)
 .c.pic.o:
 	$(CC) -c $(CFLAGS) -fPIC -o $@ $*.c

-all: libpng.a libpng.so pngtest
+all: libpng.a $(LIBNAME).so pngtest

 libpng.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@

-libpng.so: libpng.so.$(PNGMAJ)
-	ln -sf libpng.so.$(PNGMAJ) libpng.so
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc

-libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
-	ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"\"; \
+	echo ldflags=\"-L$(LIBPATH) -Wl,-rpath,$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

-libpng.so.$(PNGVER): $(OBJSDLL)
-	$(CC) -shared -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
-	 $(OBJSDLL) -L$(ZLIBLIB) -lz -lm -lc
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so

-pngtest: pngtest.o libpng.so
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)
+
+$(LIBNAME).so.$(PNGVER): $(OBJSDLL)
+	$(CC) -shared -Wl,-soname,$(LIBNAME).so.$(PNGMAJ) \
+	-o $(LIBNAME).so.$(PNGVER) \
+	$(OBJSDLL) -L$(ZLIBLIB) -lz -lm -lc
+
+pngtest: pngtest.o $(LIBNAME).so
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)

-test: pngtest
-	./pngtest
+pngtest-static: pngtest.o libpng.a
+	$(CC) -o pngtest-static $(CFLAGS) pngtest.o $(LDFLAGS_A)

-install: libpng.a libpng.so.$(PNGVER)
-	-@if [ ! -d $(INCPATH)  ]; then mkdir $(INCPATH); fi
-	-@if [ ! -d $(LIBPATH) ]; then mkdir $(LIBPATH); fi
-	cp png.h pngconf.h $(INCPATH)
-	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
-	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
-	chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
-	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
-	(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
-	 ln -sf libpng.so.$(PNGMAJ) libpng.so)
+test: pngtest pngtest-static
+	@echo ""
+	@echo "   Running pngtest dynamically linked with libpng12.so:"
+	@echo ""
+	./pngtest
+	@echo ""
+	@echo "   Running pngtest statically linked with libpng.a:"
+	@echo ""
+	./pngtest-static
+
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -sf $(LIBNAME) libpng; ln -sf $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then mkdir \
+	$(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
-	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+	/bin/rm -f *.o libpng.a $(LIBNAME).so $(LIBNAME).so.$(PNMAJ)* \
+	pngtest pngout.png

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
--- a/scripts/makefile.macosx
+++ b/scripts/makefile.macosx
@@ -1,4 +1,5 @@
 # makefile for libpng, MACOS X
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # Modified by Karin Kosina <kyrah@sim.no> 20011010:
 # build shared library (*.dylib)
@@ -14,16 +15,32 @@ ZLIBLIB=../zlib
 ZLIBINC=../zlib

 CC=cc
+
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
 CFLAGS=-fno-common -I$(ZLIBINC) -O # -g -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz
-LDSHARED=cc -lz -dynamiclib -compatibility_version $(VER) -current_version $(VER)
+LDSHARED=cc -lz -dynamiclib -compatibility_version $(PNGVER) \
+-current_version $(PNGVER)

-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
-VER = $(PNGMAJ).$(PNGMIN)
-SHAREDLIB=libpng
+LIBNAME=libpng12
 SHAREDLIB_POSTFIX=dylib
-libdir=$(prefix)/lib
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 #RANLIB=echo
 RANLIB=ranlib
@@ -34,13 +51,27 @@ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \

 all: libpng.a pngtest shared

-shared: $(SHAREDLIB).$(VER).$(SHAREDLIB_POSTFIX)
+shared: $(LIBNAME).$(PNGVER).$(SHAREDLIB_POSTFIX)
+
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! | \
+	   sed -e s/-lm// > libpng.pc
+
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"\"; \
+	echo ldflags=\"-L$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

 libpng.a: $(OBJS)
 	ar rc $@  $(OBJS)
 	$(RANLIB) $@

-$(SHAREDLIB).$(VER).$(SHAREDLIB_POSTFIX): $(OBJS)
+$(LIBNAME).$(PNGVER).$(SHAREDLIB_POSTFIX): $(OBJS)
 	$(LDSHARED) -o $@ $(OBJS)

 pngtest: pngtest.o libpng.a
@@ -49,23 +80,82 @@ pngtest: pngtest.o libpng.a
 test: pngtest
 	./pngtest

-install: libpng.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp png.h $(prefix)/include
-	cp pngconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/png.h
-	chmod 644 $(prefix)/include/pngconf.h
-	cp libpng.a $(prefix)/lib
-	chmod 644 $(prefix)/lib/libpng.a
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -f -s $(LIBNAME) libpng; \
+	ln -f -s $(LIBNAME)/* .)

-install-shared: $(SHAREDLIB).$(VER).$(SHAREDLIB_POSTFIX)
-	cp $(SHAREDLIB).$(VER).$(SHAREDLIB_POSTFIX) $(libdir)
-	(cd $(libdir); \
-	ln -s $(SHAREDLIB).$(VER).$(SHAREDLIB_POSTFIX) $(SHAREDLIB).$(SHAREDLIB_POSTFIX)) 
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -f -s $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).$(PNGVER).$(SHAREDLIB_POSTFIX) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).$(PNGMAJ)*.$(SHAREDLIB_POSTFIX)
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).$(SHAREDLIB_POSTFIX)
+	-@/bin/rm -f libpng.$(SHARED_POSTFIX)
+	-@/bin/rm -f libpng.3.$(SHARED_POSTFIX)
+	-@/bin/rm -f libpng.3.*.$(SHARED_POSTFIX)
+	cp $(LIBNAME).$(PNGVER).$(SHAREDLIB_POSTFIX) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).$(PNGVER).$(SHAREDLIB_POSTFIX)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -f -s $(LIBNAME).$(PNGVER).$(SHARED_POSTFIX) \
+	libpng.$(SHARED_POSTFIX); \
+	ln -f -s $(LIBNAME).$(PNGVER).$(SHARED_POSTFIX) \
+	libpng.3.$(SHARED_POSTFIX); \
+	ln -f -s $(LIBNAME).$(PNGVER).$(SHARED_POSTFIX) \
+	libpng.3.$(PNGMIN).$(SHARED_POSTFIX); \
+	ln -f -s $(LIBNAME).$(PNGVER).$(SHAREDLIB_POSTFIX) \
+	$(LIBNAME).$(PNGMAJ).$(SHAREDLIB_POSTFIX); \
+	ln -f -s $(LIBNAME).$(PNGMAJ).$(SHAREDLIB_POSTFIX) \
+	$(LIBNAME).$(SHAREDLIB_POSTFIX))
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -f -s $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
-	rm -f *.o libpng.a pngtest pngout.png $(SHAREDLIB).$(VER).$(SHAREDLIB_POSTFIX) $(SHAREDLIB).$(SHAREDLIB_POSTFIX)
+	rm -f *.o libpng.a pngtest pngout.png \
+	$(LIBNAME).$(PNGVER).$(SHAREDLIB_POSTFIX) \
+	$(LIBNAME).$(SHAREDLIB_POSTFIX)

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
--- a/scripts/makefile.mips
+++ b/scripts/makefile.mips
@@ -1,9 +1,22 @@
 # makefile for libpng
+# Copyright (C) Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h

 # where make install puts libpng.a and png.h
 prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 CC=cc
 CFLAGS=-I../zlib -O -systype sysv -DSYSV -w -Dmips
@@ -30,14 +43,18 @@ test: pngtest
 	./pngtest

 install: libpng.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp png.h $(prefix)/include
-	cp pngconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/png.h
-	chmod 644 $(prefix)/include/pngconf.h
-	cp libpng.a $(prefix)/lib
-	chmod 644 $(prefix)/lib/libpng.a
+	-@mkdir $(DESTDIR)$(INCPATH)
+	-@mkdir $(DESTDIR)$(INCPATH)/libpng
+	-@mkdir $(DESTDIR)$(LIBPATH)
+	-@rm -f $(DESTDIR)$(INCPATH)/png.h
+	-@rm -f $(DESTDIR)$(INCPATH)/pngconf.h
+	cp png.h $(DESTDIR)$(INCPATH)/libpng
+	cp pngconf.h $(DESTDIR)$(INCPATH)/libpng
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/png.h
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/pngconf.h
+	(cd $(DESTDIR)$(INCPATH); ln -f -s libpng/* .)
+	cp libpng.a $(DESTDIR)$(LIBPATH)
+	chmod 644 $(DESTDIR)$(LIBPATH)/libpng.a

 clean:
 	rm -f *.o libpng.a pngtest pngout.png
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -0,0 +1,44 @@
+# makefile for libpng for NetBSD for the standard
+# make obj && make depend && make && make test
+# make includes && make install
+# Copyright (C) 2002 Patrick R.L. Welche
+# For conditions of distribution and use, see copyright notice in png.h
+
+# You should also run makefile.netbsd
+
+LOCALBASE?=/usr/local
+LIBDIR=	${LOCALBASE}/lib
+MANDIR= ${LOCALBASE}/man
+INCSDIR=${LOCALBASE}/include/libpng12
+
+LIB=	png12
+SHLIB_MAJOR=	0
+SHLIB_MINOR=	1.2.3rc6
+SRCS=	pnggccrd.c png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
+		pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
+		pngwtran.c pngmem.c pngerror.c pngpread.c
+INCS=	png.h pngconf.h
+MAN=	libpng.3 libpngpf.3 png.5
+
+CPPFLAGS+=-I${.CURDIR} -DPNG_USE_PNGGCCRD
+
+# something like this for mmx assembler, but it core dumps for me at the moment
+# .if ${MACHINE_ARCH} == "i386"
+#   CPPFLAGS+=-DPNG_THREAD_UNSAFE_OK
+#   MKLINT= no
+# .else
+    CPPFLAGS+=-DPNG_NO_ASSEMBLER_CODE
+# .endif
+
+CLEANFILES+=pngtest.o pngtest
+
+pngtest.o:	pngtest.c
+	${CC} -c ${CPPFLAGS} ${CFLAGS} ${.ALLSRC} -o ${.TARGET}
+
+pngtest:	pngtest.o libpng.a
+	${CC} ${LDFLAGS} ${.ALLSRC} -o${.TARGET} -lz -lm
+
+test:	pngtest
+	cd ${.CURDIR} && ${.OBJDIR}/pngtest
+
+.include <bsd.lib.mk>
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -1,20 +1,22 @@
 # makefile for libpng for NetBSD for the standard
 # make obj && make depend && make && make test
 # make includes && make install
-# Copyright (C) 2001 Patrick R.L. Welche
+# Copyright (C) 2002 Patrick R.L. Welche
 # For conditions of distribution and use, see copyright notice in png.h

+# You should also run makefile.ne0bsd
+
 LOCALBASE?=/usr/local
 LIBDIR=	${LOCALBASE}/lib
 MANDIR= ${LOCALBASE}/man
-INCSDIR=${LOCALBASE}/include
+INCSDIR=${LOCALBASE}/include/libpng

-LIB=png
-SHLIB_MAJOR= 3
-SHLIB_MINOR= 1.2.1beta4
+LIB=	png
+SHLIB_MAJOR=	3
+SHLIB_MINOR=	1.2.3rc6
 SRCS=	pnggccrd.c png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
-	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
-	pngwtran.c pngmem.c pngerror.c pngpread.c
+		pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
+		pngwtran.c pngmem.c pngerror.c pngpread.c
 INCS=	png.h pngconf.h
 MAN=	libpng.3 libpngpf.3 png.5

--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -0,0 +1,72 @@
+# makefile for libpng
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+# For conditions of distribution and use, see copyright notice in png.h
+
+PREFIX?= /usr/local
+LIBDIR=	${PREFIX}/lib
+MANDIR= ${PREFIX}/man/cat
+
+SHLIB_MAJOR=	0
+SHLIB_MINOR=	1.2.3rc4
+
+LIB=	png
+SRCS=	png.c pngerror.c pnggccrd.c pngget.c pngmem.c pngpread.c \
+	pngread.c pngrio.c pngrtran.c pngrutil.c pngset.c pngtrans.c \
+	pngwio.c pngwrite.c pngwtran.c pngwutil.c
+
+HDRS=	png.h pngconf.h
+
+CFLAGS+= -Wall
+CPPFLAGS+= -I${.CURDIR} -DPNG_NO_ASSEMBLER_CODE -DPNG_USE_PNGGCCRD
+
+NOPROFILE= Yes
+
+CLEANFILES+= pngtest.o pngtest
+
+MAN=	libpng.3 libpngpf.3 png.5
+DOCS=	ANNOUNCE CHANGES LICENSE README libpng.txt
+
+pngtest.o:	pngtest.c
+	${CC} ${CPPFLAGS} ${CFLAGS} -c ${.ALLSRC} -o ${.TARGET}
+
+pngtest:	pngtest.o
+	${CC} ${LDFLAGS} ${.ALLSRC} -o ${.TARGET} -L${.OBJDIR} -lpng -lz -lm
+
+test:	pngtest
+	cd ${.OBJDIR} && env \
+		LD_LIBRARY_PATH="${.OBJDIR}" ${.OBJDIR}/pngtest
+
+beforeinstall:
+	if [ ! -d ${DESTDIR}${PREFIX}/include/libpng ]; then \
+	  ${INSTALL} -d -o root -g wheel ${DESTDIR}${PREFIX}/include/libpng; \
+	fi
+	if [ ! -d ${DESTDIR}${LIBDIR} ]; then \
+	  ${INSTALL} -d -o root -g wheel ${DESTDIR}${LIBDIR}; \
+	fi
+	if [ ! -d ${DESTDIR}${LIBDIR}/debug ]; then \
+	  ${INSTALL} -d -o root -g wheel ${DESTDIR}${LIBDIR}/debug; \
+	fi
+	if [ ! -d ${DESTDIR}${MANDIR}3 ]; then \
+	  ${INSTALL} -d -o root -g wheel ${DESTDIR}${MANDIR}3; \
+	fi
+	if [ ! -d ${DESTDIR}${MANDIR}5 ]; then \
+	  ${INSTALL} -d -o root -g wheel ${DESTDIR}${MANDIR}5; \
+	fi
+	if [ ! -d ${DESTDIR}${PREFIX}/share/doc/png ]; then \
+	  ${INSTALL} -d -o root -g wheel ${DESTDIR}${PREFIX}/share/doc/png; \
+	fi
+
+afterinstall:
+	@rm -f ${DESTDIR}${LIBDIR}/libpng_pic.a
+	@rm -f ${DESTDIR}${LIBDIR}/debug/libpng.a
+	@rm -f ${DESTDIR}${PREFIX}/include/png.h
+	@rm -f ${DESTDIR}${PREFIX}/include/pngconf.h
+	@rmdir ${DESTDIR}${LIBDIR}/debug 2>/dev/null || true
+	${INSTALL} ${INSTALL_COPY} -o ${SHAREOWN} -g ${SHAREGRP} \
+		-m ${NONBINMODE} ${HDRS} ${DESTDIR}${PREFIX}/include/libpng
+	${INSTALL} ${INSTALL_COPY} -o ${SHAREOWN} -g ${SHAREGRP} \
+		-m ${NONBINMODE} ${HDRS} ${DESTDIR}${PREFIX}/include
+	${INSTALL} ${INSTALL_COPY} -o ${SHAREOWN} -g ${SHAREGRP} \
+		-m ${NONBINMODE} ${DOCS} ${DESTDIR}${PREFIX}/share/doc/png
+
+.include <bsd.lib.mk>
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -1,6 +1,7 @@
 # makefile for SCO OSr5  ELF and Unixware 7 with Native cc
 # Contributed by Mike Hopkirk (hops@sco.com) modified from Makefile.lnx
 #   force ELF build dynamic linking, SONAME setting in lib and RPATH in app
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
 # For conditions of distribution and use, see copyright notice in png.h
@@ -22,14 +23,27 @@ LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 #RANLIB=ranlib
 RANLIB=echo

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 0.  You should not
 # have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
 PNGVER = $(PNGMAJ).$(PNGMIN)
+LIBNAME = libpng12

-INCPATH=$(prefix)/include
+INCPATH=$(prefix)/include/libpng
 LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
@@ -42,40 +56,113 @@ OBJSDLL = $(OBJS:.o=.pic.o)
 .c.pic.o:
 	$(CC) -c $(CFLAGS) -KPIC -o $@ $*.c

-all: libpng.a libpng.so pngtest
+all: libpng.a $(LIBNAME).so pngtest

 libpng.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@

-libpng.so: libpng.so.$(PNGMAJ)
-	ln -f -s libpng.so.$(PNGMAJ) libpng.so
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc

-libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
-	ln -f -s libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"-belf\"; \
+	echo ldflags=\"-L$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

-libpng.so.$(PNGVER): $(OBJSDLL)
-	$(CC) -G  -Wl,-h,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so
+
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)
+
+$(LIBNAME).so.$(PNGVER): $(OBJSDLL)
+	$(CC) -G  -Wl,-h,$(LIBNAME).so.$(PNGMAJ) -o $(LIBNAME).so.$(PNGVER) \
 	 $(OBJSDLL)

-pngtest: pngtest.o libpng.so
+pngtest: pngtest.o $(LIBNAME).so
 	LD_RUN_PATH=.:$(ZLIBLIB) $(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)

 test: pngtest
 	./pngtest

-install: libpng.a libpng.so.$(PNGVER)
-	-@mkdir $(INCPATH) $(LIBPATH)
-	cp png.h pngconf.h $(INCPATH)
-	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
-	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
-	chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
-	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
-	(cd $(LIBPATH); ln -f -s libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
-	 ln -f -s libpng.so.$(PNGMAJ) libpng.so)
+
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/pngconf.h
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -f -s $(LIBNAME) libpng; \
+	ln -f -s $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -f -s $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -f -s $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config
+

 clean:
-	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+	/bin/rm -f *.o libpng.a $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)* pngtest pngout.png

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -1,9 +1,22 @@
 # makefile for libpng, SGI IRIX with gcc
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h

 # where make install puts libpng.a and png.h
 prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 # Where the zlib library and include files are located
 ZLIBLIB=/usr/local/lib32
@@ -21,13 +34,27 @@ WARNMORE= # -g -DPNG_DEBUG=5
 CFLAGS=$(ABI) -I$(ZLIBINC) -O2 $(WARNMORE) -fPIC -mabi=n32
 LDFLAGS=$(ABI) -L. -L$(ZLIBLIB) -lpng -lz -lm
 LDSHARED=CC $(ABI) -shared
-
-VER=1.2.1beta4
 # See "man dso" for info about shared objects
-SONUM=3
-LIBS=libpng.so.$(SONUM).$(VER)
-SHAREDLIB=libpng.so
-libdir=$(prefix)/lib32
+
+LIBNAME=libpng12
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
+PNGVER = $(PNGMAJ).$(PNGMIN)
+LIBS=$(LIBNAME).so.$(PNGVER)
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib32
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 RANLIB=echo
 #RANLIB=ranlib
@@ -36,17 +63,31 @@ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
 	pngwtran.o pngmem.o pngerror.o pngpread.o

-all: libpng.a $(SHAREDLIB).$(VER) pngtest
+all: libpng.a $(LIBNAME).so.$(PNGVER) pngtest

 libpng.a: $(OBJS)
 	ar rc $@  $(OBJS)
 	$(RANLIB) $@

-$(SHAREDLIB).$(VER): $(OBJS)
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc
+
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME) -DPNG_USE_PNGGCCRD \
+		-DPNG_NO_ASSEMBLER_CODE\"; \
+	echo cflags=\"$(ABI)\"; \
+	echo ldflags=\"-L$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config
+
+$(LIBNAME).so.$(PNGVER): $(OBJS)
 	$(LDSHARED) -o $@ $(OBJS)
-	rm -f $(SHAREDLIB) $(SHAREDLIB).$(SONUM)
-	ln -s $@ $(SHAREDLIB)
-	ln -s $@ $(SHAREDLIB).$(SONUM)
+	rm -f $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)
+	ln -s -f $@ $(LIBNAME).so
+	ln -s -f $@ $(LIBNAME).so.$(PNGMAJ)

 pngtest: pngtest.o libpng.a
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
@@ -54,24 +95,72 @@ pngtest: pngtest.o libpng.a
 test: pngtest
 	./pngtest

-install: libpng.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp png.h $(prefix)/include
-	cp pngconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/png.h
-	chmod 644 $(prefix)/include/pngconf.h
-	cp libpng.a $(prefix)/lib
-	chmod 644 $(prefix)/lib/libpng.a

-install-shared: $(SHAREDLIB).$(VER)
-	cp $(SHAREDLIB).$(VER) $(libdir); chmod 755 $(SHAREDLIB).$(VER)
-	(cd $(libdir); if test -f $(SHAREDLIB).$(VER); then \
-	rm -f $(SHAREDLIB) $(SHAREDLIB).$(SONUM); \
-	ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB); \
-	ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB).$(SONUM); \
-	(ldconfig || true)  >/dev/null 2>&1; \
-	fi)
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -sf $(LIBNAME) libpng; \
+	ln -sf $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
 	rm -f *.o libpng.a pngtest pngout.png
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -1,9 +1,9 @@
-# makefile for libpng (.a and .so), SGI IRIX with 'cc'
-# Copyright (C) 2001 Glenn Randers-Pehrson
+# makefile for libpng.a and libpng12.so, SGI IRIX with 'cc'
+# Copyright (C) 2001-2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h

-# where make install puts libpng.a and png.h
+# where make install puts libpng.a, libpng12.so and libpng12/png.h
 prefix=/usr/local

 # Where the zlib library and include files are located
@@ -24,36 +24,67 @@ WARNMORE=-fullwarn
 # Note: -KPIC is the default anyhow
 #CFLAGS= $(ABI) -I$(ZLIBINC) -O $(WARNMORE) -KPIC -DPNG_USE_PNGGCCRD # -g -DPNG_DEBUG=5
 CFLAGS=$(ABI) -I$(ZLIBINC) -O $(WARNMORE) -DPNG_USE_PNGGCCRD -DPNG_NO_ASSEMBLER_CODE
+LDFLAGS_A=$(ABI) -L. -L$(ZLIBLIB) -lpng12 -lz -lm
 LDFLAGS=$(ABI) -L. -L$(ZLIBLIB) -lpng -lz -lm
 LDSHARED=cc $(ABI) -shared
-
-VER=1.2.1beta4
 # See "man dso" for info about shared objects
-SONUM=3
-SHAREDLIB=libpng.so
-libdir=$(prefix)
-#libdir=$(prefix)/lib32
+
+LIBNAME=libpng12
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
+PNGVER = $(PNGMAJ).$(PNGMIN)

 RANLIB=echo
 #RANLIB=ranlib

+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+#LIBPATH=$(prefix)/lib32
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=
+
 OBJS = pnggccrd.o png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
 	pngwtran.o pngmem.o pngerror.o pngpread.o

 all: libpng.a pngtest shared

-shared: $(SHAREDLIB).$(SONUM).$(VER)
+shared: $(LIBNAME).so.$(PNGVER)
+
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc
+
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME) -DPNG_USE_PNGGCCRD \
+		-DPNG_NO_ASSEMBLER_CODE\"; \
+	echo cflags=\"$(ABI)\"; \
+	echo ldflags=\"-L$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

 libpng.a: $(OBJS)
 	ar rc $@  $(OBJS)
 	$(RANLIB) $@

-$(SHAREDLIB).$(SONUM).$(VER): $(OBJS)
+$(LIBNAME).so.$(PNGVER): $(OBJS)
 	$(LDSHARED) -o $@ $(OBJS)
-	rm -f $(SHAREDLIB) $(SHAREDLIB).?
-	ln -s $@ $(SHAREDLIB)
-	ln -s $@ $(SHAREDLIB).$(SONUM)
+	rm -f $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)
+	ln -s -f $@ $(LIBNAME).so
+	ln -s -f $@ $(LIBNAME).so.$(PNGMAJ)

 pngtest: pngtest.o libpng.a
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
@@ -61,26 +92,75 @@ pngtest: pngtest.o libpng.a
 test: pngtest
 	./pngtest

-install: libpng.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp png.h $(prefix)/include
-	cp pngconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/png.h
-	chmod 644 $(prefix)/include/pngconf.h
-	cp libpng.a $(prefix)/lib
-	chmod 644 $(prefix)/lib/libpng.a
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -sf $(LIBNAME) libpng; \
+	ln -sf $(LIBNAME)/* .)

-install-shared: $(SHAREDLIB).$(SONUM).$(VER)
-	cp $(SHAREDLIB).$(SONUM).$(VER) $(libdir)
-	chmod 755 $(SHAREDLIB).$(SONUM).$(VER)
-	(cd $(libdir); if test -f $(SHAREDLIB).$(SONUM).$(VER); then \
-	rm -f $(SHAREDLIB) $(SHAREDLIB).$(SONUM); \
-	ln -s $(SHAREDLIB).$(SONUM).$(VER) $(SHAREDLIB).$(SONUM); \
-	ln -s $(SHAREDLIB).$(SONUM) $(SHAREDLIB))
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
-	rm -f *.o libpng.a pngtest pngout.png $(SHAREDLIB).*
+	rm -f *.o libpng.a pngtest pngout.png $(LIBNAME).so \
+	$(LIBNAME).so.$(PNGMAJ)*

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -1,6 +1,7 @@
 # makefile for libpng on Solaris 9 (beta) with Forte cc
 # Updated by Chad Schrock for Solaris 9
 # Contributed by William L. Sebok, based on makefile.linux
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1998-2001 Greg Roelofs
 # Copyright (C) 1996-1997 Andreas Dilger
 # For conditions of distribution and use, see copyright notice in png.h
@@ -32,14 +33,27 @@ LDFLAGS=-L. -R. -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng -lz -lm
 #RANLIB=ranlib
 RANLIB=echo

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 0.  You should not
 # have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
 PNGVER = $(PNGMAJ).$(PNGMIN)
+LIBNAME = libpng12

 INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
@@ -52,19 +66,32 @@ OBJSDLL = $(OBJS:.o=.pic.o)
 .c.pic.o:
 	$(CC) -c $(CFLAGS) -KPIC -o $@ $*.c

-all: libpng.a libpng.so pngtest
+all: libpng.a $(LIBNAME).so pngtest

 libpng.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@

-libpng.so: libpng.so.$(PNGMAJ)
-	ln -f -s libpng.so.$(PNGMAJ) libpng.so
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc

-libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
-	ln -f -s libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"\"; \
+	echo ldflags=\"-L$(LIBPATH) -R$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

-libpng.so.$(PNGVER): $(OBJSDLL)
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so
+
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)
+
+$(LIBNAME).so.$(PNGVER): $(OBJSDLL)
 	@case "`type ld`" in *ucb*) \
 	echo; \
 	echo '## WARNING:'; \
@@ -77,27 +104,85 @@ libpng.so.$(PNGVER): $(OBJSDLL)
 	echo; \
 	;; \
 	esac
-	$(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h libpng.so.$(PNGMAJ) \
-	 -o libpng.so.$(PNGVER) $(OBJSDLL) -lz
+	$(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h $(LIBNAME).so.$(PNGMAJ) \
+	 -o $(LIBNAME).so.$(PNGVER) $(OBJSDLL) -lz

-pngtest: pngtest.o libpng.so
+pngtest: pngtest.o $(LIBNAME).so
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)

 test: pngtest
 	./pngtest

-install: libpng.a libpng.so.$(PNGVER)
-	-@mkdir $(INCPATH) $(LIBPATH)
-	cp png.h pngconf.h $(INCPATH)
-	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
-	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
-	chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
-	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
-	(cd $(LIBPATH); ln -f -s libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
-	 ln -f -s libpng.so.$(PNGMAJ) libpng.so)
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -f -s $(LIBNAME) libpng)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(INCPATH); ln -f -s $(LIBNAME) libpng; \
+	ln -f -s $(LIBNAME)/* .)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then mkdir \
+	$(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -f -s $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config
+

 clean:
-	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+	/bin/rm -f *.o libpng.a $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)* \
+	pngtest pngout.png

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -1,4 +1,5 @@
 # makefile for libpng on Solaris 2.x with gcc
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Contributed by William L. Sebok, based on makefile.linux
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
@@ -6,7 +7,7 @@

 CC=gcc

-# Where make install puts libpng.a, libpng.so*, and png.h
+# Where make install puts libpng.a, libpng12.so*, and png.h
 prefix=/usr/local

 # Where the zlib library and include files are located
@@ -28,14 +29,27 @@ LDFLAGS=-L. -R. -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng -lz -lm
 #RANLIB=ranlib
 RANLIB=echo

-# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
+# read libpng.txt or png.h to see why PNGMAJ is 0.  You should not
 # have to change it.
-PNGMAJ = 3
-PNGMIN = 1.2.1beta4
+PNGMAJ = 0
+PNGMIN = 1.2.3rc6
 PNGVER = $(PNGMAJ).$(PNGMIN)
+LIBNAME = libpng12

 INCPATH=$(prefix)/include
 LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
@@ -48,19 +62,33 @@ OBJSDLL = $(OBJS:.o=.pic.o)
 .c.pic.o:
 	$(CC) -c $(CFLAGS) -fPIC -o $@ $*.c

-all: libpng.a libpng.so pngtest
+all: libpng.a $(LIBNAME).so pngtest

 libpng.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@

-libpng.so: libpng.so.$(PNGMAJ)
-	ln -f -s libpng.so.$(PNGMAJ) libpng.so
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc

-libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
-	ln -f -s libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME) -DPNG_USE_PNGGCCRD \
+		-DPNG_NO_ASSEMBLER_CODE\"; \
+	echo cflags=\"$(ABI)\"; \
+	echo ldflags=\"-L$(LIBPATH) -R$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config

-libpng.so.$(PNGVER): $(OBJSDLL)
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so
+
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)
+
+$(LIBNAME).so.$(PNGVER): $(OBJSDLL)
 	@case "`type ld`" in *ucb*) \
 	echo; \
 	echo '## WARNING:'; \
@@ -73,27 +101,84 @@ libpng.so.$(PNGVER): $(OBJSDLL)
 	echo; \
 	;; \
 	esac
-	$(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h libpng.so.$(PNGMAJ) \
-	 -o libpng.so.$(PNGVER) $(OBJSDLL) -lz
+	$(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h $(LIBNAME).so.$(PNGMAJ) \
+	 -o $(LIBNAME).so.$(PNGVER) $(OBJSDLL) -lz

-pngtest: pngtest.o libpng.so
+pngtest: pngtest.o $(LIBNAME).so
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)

 test: pngtest
 	./pngtest

-install: libpng.a libpng.so.$(PNGVER)
-	-@mkdir $(INCPATH) $(LIBPATH)
-	cp png.h pngconf.h $(INCPATH)
-	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
-	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
-	chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
-	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
-	(cd $(LIBPATH); ln -f -s libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
-	 ln -f -s libpng.so.$(PNGMAJ) libpng.so)
+install-headers: png.h pngconf.h
+	-@if [ ! -d $(DESTDIR)$(INCPATH) ]; then mkdir $(DESTDIR)$(INCPATH); fi
+	-@if [ ! -d $(DESTDIR)$(INCPATH)/$(LIBNAME) ]; then \
+	mkdir $(DESTDIR)$(INCPATH)/$(LIBNAME); fi
+	cp png.h pngconf.h $(DESTDIR)$(INCPATH)/$(LIBNAME)
+	chmod 644 $(DESTDIR)$(INCPATH)/$(LIBNAME)/png.h \
+	$(DESTDIR)$(INCPATH)/$(LIBNAME)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/png.h $(DESTDIR)$(INCPATH)/pngconf.h
+	-@/bin/rm -f $(DESTDIR)$(INCPATH)/libpng
+	(cd $(DESTDIR)$(INCPATH); ln -f -s $(LIBNAME) libpng; \
+	ln -f -s $(LIBNAME)/* .)
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	cp libpng.a $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	chmod 644 $(DESTDIR)$(LIBPATH)/$(LIBNAME).a
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.a
+	(cd $(DESTDIR)$(LIBPATH); ln -f -s $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DESTDIR)$(LIBPATH) ]; then mkdir $(DESTDIR)$(LIBPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGMAJ)* \
+	$(DESTDIR)$(LIBPATH)/$(LIBNAME).so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DESTDIR)$(LIBPATH)
+	chmod 755 $(DESTDIR)$(LIBPATH)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DESTDIR)$(LIBPATH); \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so; \
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ))
+	-@if [ ! -d $(DESTDIR)$(LIBPATH)/pkgconfig ]; then \
+	mkdir $(DESTDIR)$(LIBPATH)/pkgconfig; fi
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DESTDIR)$(LIBPATH)/pkgconfig/libpng.pc
+	cp libpng.pc $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DESTDIR)$(LIBPATH)/pkgconfig/$(LIBNAME).pc
+	(cd $(DESTDIR)$(LIBPATH)/pkgconfig; ln -f -s $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DESTDIR)$(MANPATH) ]; then mkdir $(DESTDIR)$(MANPATH); fi
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man3 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man3; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpng.3
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man3/libpngpf.3
+	cp libpng.3 $(DESTDIR)$(MANPATH)/man3
+	cp libpngpf.3 $(DESTDIR)$(MANPATH)/man3
+	-@if [ ! -d $(DESTDIR)$(MANPATH)/man5 ]; then \
+	mkdir $(DESTDIR)$(MANPATH)/man5; fi
+	-@/bin/rm -f $(DESTDIR)$(MANPATH)/man5/png.5
+	cp png.5 $(DESTDIR)$(MANPATH)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DESTDIR)$(BINPATH) ]; then \
+	mkdir $(DESTDIR)$(BINPATH); fi
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/libpng-config
+	-@/bin/rm -f $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	cp libpng-config $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	chmod 755 $(DESTDIR)$(BINPATH)/$(LIBNAME)-config
+	(cd $(DESTDIR)$(BINPATH); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config

 clean:
-	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+	/bin/rm -f *.o libpng.a $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)* \
+	pngtest pngout.png

 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
--- a/scripts/makefile.std
+++ b/scripts/makefile.std
@@ -1,9 +1,22 @@
 # makefile for libpng
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h

 # where make install puts libpng.a and png.h
 prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 # Where the zlib library and include files are located
 #ZLIBLIB=/usr/local/lib
@@ -35,14 +48,18 @@ test: pngtest
 	./pngtest

 install: libpng.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp png.h $(prefix)/include
-	cp pngconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/png.h
-	chmod 644 $(prefix)/include/pngconf.h
-	cp libpng.a $(prefix)/lib
-	chmod 644 $(prefix)/lib/libpng.a
+	-@mkdir $(DESTDIR)$(INCPATH)
+	-@mkdir $(DESTDIR)$(INCPATH)/libpng
+	-@mkdir $(DESTDIR)$(LIBPATH)
+	-@rm -f $(DESTDIR)$(INCPATH)/png.h
+	-@rm -f $(DESTDIR)$(INCPATH)/pngconf.h
+	cp png.h $(DESTDIR)$(INCPATH)/libpng
+	cp pngconf.h $(DESTDIR)$(INCPATH)/libpng
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/png.h
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/pngconf.h
+	(cd $(DESTDIR)$(INCPATH); ln -f -s libpng/* .)
+	cp libpng.a $(DESTDIR)$(LIBPATH)
+	chmod 644 $(DESTDIR)$(LIBPATH)/libpng.a

 clean:
 	rm -f *.o libpng.a pngtest pngout.png
--- a/scripts/makefile.sunos
+++ b/scripts/makefile.sunos
@@ -1,9 +1,22 @@
 # makefile for libpng
+# Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h

 # where make install puts libpng.a and png.h
 prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, that location must already exist before
+# you execute make install.
+DESTDIR=

 # Where the zlib library and include files are located
 #ZLIBLIB=/usr/local/lib
@@ -39,14 +52,18 @@ test: pngtest
 	./pngtest

 install: libpng.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp png.h $(prefix)/include
-	cp pngconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/png.h
-	chmod 644 $(prefix)/include/pngconf.h
-	cp libpng.a $(prefix)/lib
-	chmod 644 $(prefix)/lib/libpng.a
+	-@mkdir $(DESTDIR)$(INCPATH)
+	-@mkdir $(DESTDIR)$(INCPATH)/libpng
+	-@mkdir $(DESTDIR)$(LIBPATH)
+	-@rm -f $(DESTDIR)$(INCPATH)/png.h
+	-@rm -f $(DESTDIR)$(INCPATH)/pngconf.h
+	cp png.h $(DESTDIR)$(INCPATH)/libpng
+	cp pngconf.h $(DESTDIR)$(INCPATH)/libpng
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/png.h
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/pngconf.h
+	(cd $(DESTDIR)$(INCPATH); ln -f -s libpng/* .)
+	cp libpng.a $(DESTDIR)$(LIBPATH)
+	chmod 644 $(DESTDIR)$(LIBPATH)/libpng.a

 clean:
 	rm -f *.o libpng.a pngtest pngout.png
--- a/scripts/pngdef.pas
+++ b/scripts/pngdef.pas
@@ -1,14 +1,14 @@
 unit pngdef;

 // Caution: this file has fallen out of date since version 1.0.5.  Write to
-// png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu about bringing
-// it up to date.
+// png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu about volunteering
+// to it up to date.

 interface

 const
-  PNG_LIBPNG_VER_STRING = '1.2.1beta4';
-  PNG_LIBPNG_VER        =  10201;
+  PNG_LIBPNG_VER_STRING = '1.2.3rc6';
+  PNG_LIBPNG_VER        =  10203;

 type
  png_uint_32 = Cardinal;
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -2,7 +2,7 @@
 ; PNG.LIB module definition file for OS/2
 ;----------------------------------------

-; Version 1.2.1beta4
+; Version 1.2.3rc6

 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"
@@ -184,9 +184,6 @@ EXPORTS
  png_convert_to_rfc1123
  png_set_invalid

-;To be added at version 1.2.0
-; png_permit_mng_features
-
 ; Added at version 1.2.0:
  png_mmx_support
  png_permit_empty_plte
@@ -199,6 +196,13 @@ EXPORTS
  png_set_asm_flags
  png_init_mmx_flags

+; Added at version 1.2.2:
+  png_handle_as_unknown
+
+; Added at version 1.2.2 and deleted from 1.2.3:
+; png_zalloc
+; png_zfree
+
 ; These are not present when libpng is compiled with PNG_NO_GLOBAL_ARRAYS
  png_libpng_ver
  png_pass_start
Author	SHA1	Message	Date
Glenn Randers-Pehrson	22f28966c4	Imported from libpng-1.2.3rc6.tar	2009-04-06 16:07:08 -05:00
Glenn Randers-Pehrson	837a3d1745	Imported from libpng-1.2.3rc5.tar	2009-04-06 16:07:06 -05:00
Glenn Randers-Pehrson	704228f7e7	Imported from libpng-1.2.3rc4.tar	2009-04-06 16:07:04 -05:00
Glenn Randers-Pehrson	299d73503c	Imported from libpng-1.2.3rc3.tar	2009-04-06 16:07:02 -05:00
Glenn Randers-Pehrson	25d8224d15	Imported from libpng-1.2.3rc2.tar	2009-04-06 16:07:00 -05:00
Glenn Randers-Pehrson	03008a08d1	Imported from libpng-1.2.3rc1.tar	2009-04-06 16:06:58 -05:00
Glenn Randers-Pehrson	4fb046a52d	Imported from libpng-1.2.2.tar	2009-04-06 16:06:56 -05:00
Glenn Randers-Pehrson	fcbd7870e9	Imported from libpng-1.2.2rc1.tar	2009-04-06 16:06:54 -05:00
Glenn Randers-Pehrson	25228abdc1	Imported from libpng-1.2.2beta6.tar	2009-04-06 16:06:52 -05:00
Glenn Randers-Pehrson	73d57cb97b	Imported from libpng-1.2.2beta5.tar	2009-04-06 16:06:50 -05:00
Glenn Randers-Pehrson	377657d1d6	Imported from libpng-1.2.2beta4.tar	2009-04-06 16:06:49 -05:00
Glenn Randers-Pehrson	c1bfe686ce	Imported from libpng-1.2.2beta3.tar	2009-04-06 16:06:47 -05:00
Glenn Randers-Pehrson	c6de22da1d	Imported from libpng-1.2.2beta2.tar	2009-04-06 16:06:45 -05:00
Glenn Randers-Pehrson	9c0f094b21	Imported from libpng-1.2.2beta1.tar	2009-04-06 16:06:43 -05:00
Glenn Randers-Pehrson	f50c91b7bd	Imported from libpng-1.2.1.tar	2009-04-06 16:06:41 -05:00
Glenn Randers-Pehrson	db3b88dad2	Imported from libpng-1.2.1rc2.tar	2009-04-06 16:06:39 -05:00
Glenn Randers-Pehrson	ae498dcff3	Imported from libpng-1.2.1rc1.tar	2009-04-06 16:06:37 -05:00