diff --git a/ANNOUNCE b/ANNOUNCE
index 4c12ae5f3..966ee7880 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -200,6 +200,7 @@ version 1.5.0beta22 [April 28, 2010]
   Fixed dependencies of GET_INT_32 - it does not require READ_INT_FUNCTIONS
     because it has a macro equivalent.
   Improved the options.awk script; added an "everything off" option.
+  Revised contrib/pngminim to use the "everything off" option in pngusr.dfa.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 19edcaf39..027566655 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2682,6 +2682,7 @@ version 1.5.0beta22 [April 28, 2010]
   Fixed dependencies of GET_INT_32 - it does not require READ_INT_FUNCTIONS
     because it has a macro equivalent.
   Improved the options.awk script; added an "everything off" option.
+  Revised contrib/pngminim to use the "everything off" option in pngusr.dfa.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/contrib/pngminim/decoder/README b/contrib/pngminim/decoder/README
index a656e0b93..5618cb78a 100644
--- a/contrib/pngminim/decoder/README
+++ b/contrib/pngminim/decoder/README
@@ -1,9 +1,10 @@
-This demonstrates the use of PNG_USER_CONFIG and pngusr.h
+This demonstrates the use of PNG_USER_CONFIG, pngusr.h and pngusr.dfa
 
-To build a minimal read-only decoder with embedded libpng and zlib, run
+The makefile builds a minimal read-only decoder with embedded libpng
+and zlib.
 
-    gather.sh  # to collect needed files from pngminus, libpng, and zlib
-    make
+Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
+on the make command line.
 
 If you prefer to use the shared libraries, go to contrib/pngminus
 and build the png2pnm application there. 
diff --git a/contrib/pngminim/decoder/gather.sh b/contrib/pngminim/decoder/gather.sh
index 5006c537b..e69de29bb 100755
--- a/contrib/pngminim/decoder/gather.sh
+++ b/contrib/pngminim/decoder/gather.sh
@@ -1,15 +0,0 @@
-test -n "${PNGSRC}" || PNGSRC=../../..
-cp ${PNGSRC}/contrib/pngminus/png2pnm.c pngm2pnm.c
-cp "${PNGSRC}"/*.h .
-cp "${PNGSRC}"/*.c .
-rm example.c pngtest.c pngpread.c pngw*.c
-rm -f pnglibconf.h
-test -d scripts || mkdir scripts
-cp "${PNGSRC}"/scripts/pnglibconf.mak scripts
-cp "${PNGSRC}"/scripts/pnglibconf.dfa scripts
-cp "${PNGSRC}"/scripts/options.awk scripts
-# change the following if zlib is somewhere else
-test -n "${ZLIBSRC}" || ZLIBSRC="${PNGSRC}"/../zlib
-cp "${ZLIBSRC}"/*.h .
-cp "${ZLIBSRC}"/*.c .
-rm minigzip.c example.c compress.c deflate.c gz*
diff --git a/contrib/pngminim/decoder/makefile b/contrib/pngminim/decoder/makefile
index 49b91fea9..9e6a0e3ff 100644
--- a/contrib/pngminim/decoder/makefile
+++ b/contrib/pngminim/decoder/makefile
@@ -4,24 +4,73 @@
 #CC=cc
 CC=gcc
 LD=$(CC)
+STRIP=strip
 
 RM=rm -f
+COPY=cp
 
-CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP \
-       -DdeflateParams\(a,b,c\)=Z_OK -I. -O1
+CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP -I. -O1
 
 C=.c
 O=.o
 L=.a
 E=
 
-ZOBJS  = adler32$(O) crc32$(O) \
-	 infback$(O) inffast$(O) inflate$(O) inftrees$(O) \
-	 trees$(O) uncompr$(O) zutil$(O)
+# Where to find the source code:
+PNGSRC =../../..
+ZLIBSRC=$(PNGSRC)/../zlib
+PROGSRC=$(PNGSRC)/contrib/pngminus
 
-OBJS  = pngm2pnm$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
+# Zlib (minimal inflate requirements - crc32 is used by libpng)
+# zutil can be eliminated if you provide your own zcalloc and zcfree
+ZSRCS  = adler32$(C) crc32$(C) \
+	 inffast$(C) inflate$(C) inftrees$(C) \
+	 zutil$(C)
+
+# Standard headers
+ZH     = zlib.h crc32.h inffast.h inffixed.h \
+	 inflate.h inftrees.h zutil.h
+
+# Machine generated headers
+ZCONF  = zconf.h
+
+# Headers callers use
+ZINC   = zlib.h $(ZCONF)
+
+# Headers the Zlib source uses
+ZHDRS  = $(ZH) $(ZCONF)
+
+ZOBJS  = adler32$(O) crc32$(O) \
+	 inffast$(O) inflate$(O) inftrees$(O) \
+	 zutil$(O)
+
+# libpng
+PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
+	pngread$(C) pngrio$(C) pngrtran$(C) pngrutil$(C) \
+	pngset$(C) pngtrans$(C)
+	
+# Standard headres
+PNGH   =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
+
+# Machine generated headers
+PNGCONF=pnglibconf.h
+
+# Headers callers use
+PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
+
+# Headers the PNG library uses
+PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
+
+PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
 	pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
-	pngset$(O) pngtrans$(O)  $(ZOBJS)
+	pngset$(O) pngtrans$(O)
+
+PROGSRCS= pngm2pnm$(C)
+PROGHDRS=
+PROGDOCS=
+PROGOBJS= pngm2pnm$(O)
+
+OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
 
 # implicit make rules -------------------------------------------------------
 
@@ -35,23 +84,63 @@ all: pngm2pnm$(E)
 
 pngm2pnm$(E): $(OBJS)
 	$(LD) -o pngm2pnm$(E) $(OBJS)
-	strip pngm2pnm$(E)
+	$(STRIP) pngm2pnm$(E)
 
-pnglibconf.h: scripts/pnglibconf.mak scripts/pnglibconf.dfa \
-	scripts/options.awk pngusr.h
-
-	rm -f pnglibconf.h
-
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak\
-	 CPPFLAGS=-DPNG_USER_CONFIG $@
+# The DFA_XTRA setting turns all libpng options off then
+# turns on those required for this minimal build.
+# The CPP_FLAGS setting causes pngusr.h to be included in
+# both the build of pnglibconf.h and, subsequently, when
+# building libpng itself.
+$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak\
+	$(PNGSRC)/scripts/pnglibconf.dfa \
+	$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
+	$(RM) pnglibconf.h pnglibconf.dfn
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG"\
+	    DFA_XTRA="pngusr.dfa" $@
 
 clean:
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak clean
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) clean
 	$(RM) pngm2pnm$(O)
 	$(RM) pngm2pnm$(E)
 	$(RM) $(OBJS)
 
-$(OBJS): png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h\
-	 pnginfo.h pngdebug.h zlib.h
+# distclean also removes the copied source and headers
+distclean: clean
+	$(RM) -r scripts # historical reasons
+	$(RM) $(PNGSRCS) $(PNGH)
+	$(RM) $(ZSRCS) $(ZH) $(ZCONF)
+	$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
+
+# Header file dependencies:
+$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
+$(PNGOBJS): $(PNGHDRS) $(ZINC)
+$(ZOBJS): $(ZHDRS)
+
+# Gather the source code from the respective directories
+$(PNGSRCS) $(PNGH): $(PNGSRC)/$@
+	$(RM) $@
+	$(COPY) $(PNGSRC)/$@ $@
+
+# No dependency on the ZLIBSRC target so that it only needs
+# to be specified once.
+$(ZSRCS) $(ZH):
+	$(RM) $@
+	$(COPY) $(ZLIBSRC)/$@ $@
+
+# The unconfigured zconf.h varies in name according to the
+# zlib release
+$(ZCONF):
+	$(RM) $@
+	@for f in zconf.h.in zconf.in.h zconf.h; do\
+	    test -r $(ZLIBSRC)/$$f &&\
+	    echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
+	    $(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
+	done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
+
+pngm2pnm.c: $(PROGSRC)/png2pnm.c
+	$(RM) $@
+	$(COPY) $(PROGSRC)/png2pnm.c $@
 
 # End of makefile for pngm2pnm
diff --git a/contrib/pngminim/decoder/pngusr.dfa b/contrib/pngminim/decoder/pngusr.dfa
new file mode 100644
index 000000000..ec4495e5d
--- /dev/null
+++ b/contrib/pngminim/decoder/pngusr.dfa
@@ -0,0 +1,27 @@
+# pngminim/decoder/pngusr.dfa
+#
+# Copyright (c) 2010 Glenn Randers-Pehrson
+#
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+# First all the build options off:
+everything = off
+
+# All that is required is some read code. This example switches
+# on the sequential read code (see ../preader for a progressive
+# read example).
+option SEQUENTIAL_READ on
+
+# You must choose fixed or floating point arithmetic:
+option FLOATING_POINT on
+# option FIXED_POINT on
+
+# Your program will probably need other options.  The example
+# program here, pngm2pnm, requires the following.  Take a look
+# at pnglibconf.h to find out the full set of what has to be
+# enabled to make the following work.
+option SETJMP on
+option STDIO on
+option READ_EXPAND on
diff --git a/contrib/pngminim/decoder/pngusr.h b/contrib/pngminim/decoder/pngusr.h
index 397eb1164..0b5b9bce5 100644
--- a/contrib/pngminim/decoder/pngusr.h
+++ b/contrib/pngminim/decoder/pngusr.h
@@ -16,64 +16,17 @@
   /* No 16-bit support beyond reading with strip_16 */
 #endif
 
-#define PNG_USER_PRIVATEBUILD "PNG minimal build"
-#define PNG_USER_DLLFNAME_POSTFIX "MN"
+/* If pngusr.h is included during the build the following must
+ * be defined either here or in the .dfa file (pngusr.dfa in
+ * this case).  To include pngusr.h set -DPNG_USER_CONFIG in
+ * CPPFLAGS
+ */
+#define PNG_USER_PRIVATEBUILD "libpng minimal conformant PNG decoder"
+#define PNG_USER_DLLFNAME_POSTFIX "mr"
 
+/* List options to turn off features of the build that do not
+ * affect the API (so are not recorded in pnglibconf.h)
+ */
 #define PNG_NO_WARNINGS
-#define PNG_NO_ERROR_TEXT
-#define PNG_NO_READ_INT_FUNCTIONS
-
-#define PNG_NO_READ_BGR
-#define PNG_NO_READ_GAMMA
-#define PNG_NO_READ_BACKGROUND
-#define PNG_NO_READ_QUANTIZE
-#define PNG_NO_READ_INVERT
-#define PNG_NO_READ_SHIFT
-#define PNG_NO_READ_PACK
-#define PNG_NO_READ_PACKSWAP
-#define PNG_NO_READ_FILLER
-#define PNG_NO_READ_SWAP
-#define PNG_NO_READ_SWAP_ALPHA
-#define PNG_NO_READ_INVERT_ALPHA
-#define PNG_NO_READ_RGB_TO_GRAY
-#define PNG_NO_READ_USER_TRANSFORM
-#define PNG_NO_READ_bKGD
-#define PNG_NO_READ_cHRM
-#define PNG_NO_READ_gAMA
-#define PNG_NO_READ_hIST
-#define PNG_NO_READ_iCCP
-#define PNG_NO_READ_pCAL
-#define PNG_NO_READ_pHYs
-#define PNG_NO_READ_sBIT
-#define PNG_NO_READ_sCAL
-#define PNG_NO_READ_sPLT
-#define PNG_NO_READ_sRGB
-#define PNG_NO_READ_TEXT
-#define PNG_NO_READ_tIME
-#define PNG_NO_READ_UNKNOWN_CHUNKS
-#define PNG_NO_READ_USER_CHUNKS
-#define PNG_NO_READ_EMPTY_PLTE
-#define PNG_NO_READ_OPT_PLTE
-#define PNG_NO_READ_STRIP_ALPHA
-#define PNG_NO_READ_oFFs
-
-#define PNG_NO_WRITE_SUPPORTED
-
-#define PNG_NO_INFO_IMAGE
-#define PNG_NO_IO_STATE
-#define PNG_NO_USER_MEM
-#define PNG_NO_FIXED_POINT_SUPPORTED
-#define PNG_NO_MNG_FEATURES
-#define PNG_NO_USER_TRANSFORM_PTR
-#define PNG_NO_HANDLE_AS_UNKNOWN
-#define PNG_NO_CONSOLE_IO
-#define PNG_NO_ZALLOC_ZERO
-#define PNG_NO_ERROR_NUMBERS
-#define PNG_NO_EASY_ACCESS
-#define PNG_NO_PROGRESSIVE_READ
-#define PNG_NO_USER_LIMITS
-#define PNG_NO_SET_USER_LIMITS
-#define PNG_NO_TIME_RFC1123
 
 #endif /* MINRDPNGCONF_H */
-
diff --git a/contrib/pngminim/encoder/README b/contrib/pngminim/encoder/README
index 2285544f4..04fd27f44 100644
--- a/contrib/pngminim/encoder/README
+++ b/contrib/pngminim/encoder/README
@@ -1,9 +1,10 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h
 
-To build a minimal write-only decoder with embedded libpng and zlib, run
+The makefile builds a minimal write-only decoder with embedded libpng
+and zlib.
+
+Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
+on the make command line.
 
-    gather.sh  # to collect needed files from pngminus, libpng, and zlib
-    make
- 
 If you prefer to use the shared libraries, go to contrib/pngminus
 and build the pnm2png application there. 
diff --git a/contrib/pngminim/encoder/dummy_inflate.c b/contrib/pngminim/encoder/dummy_inflate.c
index 1422edb43..e606e60a8 100644
--- a/contrib/pngminim/encoder/dummy_inflate.c
+++ b/contrib/pngminim/encoder/dummy_inflate.c
@@ -1,27 +1,5 @@
 #include "zlib.h"
 
-int ZEXPORT inflate(strm, flush)
-z_streamp strm;
-int flush;
-{ return Z_OK ; }
-
 int ZEXPORT inflateReset(strm)
 z_streamp strm;
 { return Z_OK ; }
-
-int ZEXPORT inflateEnd(strm)
-z_streamp strm;
-{ return Z_STREAM_ERROR ; }
-
-int ZEXPORT inflateInit_(strm, version, stream_size)
-z_streamp strm;
-const char *version;
-int stream_size;
-{ return Z_OK ; }
-
-int ZEXPORT inflateInit2_(strm, windowBits, version, stream_size)
-z_streamp strm;
-int windowBits;
-const char *version;
-int stream_size;
-{ return Z_STREAM_ERROR ; }
diff --git a/contrib/pngminim/encoder/gather.sh b/contrib/pngminim/encoder/gather.sh
index 04f227c0c..e69de29bb 100755
--- a/contrib/pngminim/encoder/gather.sh
+++ b/contrib/pngminim/encoder/gather.sh
@@ -1,17 +0,0 @@
-test -n "${PNGSRC}" || PNGSRC=../../..
-cp ${PNGSRC}/contrib/pngminus/pnm2png.c pnm2pngm.c
-cp "${PNGSRC}"/*.h .
-cp "${PNGSRC}"/*.c .
-rm example.c pngtest.c pngr*.c pngpread.c
-rm -f pnglibconf.h
-test -d scripts || mkdir scripts
-cp "${PNGSRC}"/scripts/pnglibconf.mak scripts
-cp "${PNGSRC}"/scripts/pnglibconf.dfa scripts
-cp "${PNGSRC}"/scripts/options.awk scripts
-# change the following if zlib is somewhere else
-test -n "${ZLIBSRC}" || ZLIBSRC="${PNGSRC}"/../zlib
-cp "${ZLIBSRC}"/*.h .
-cp "${ZLIBSRC}"/*.c .
-rm inf*.[ch]
-rm minigzip.c example.c gz*
-
diff --git a/contrib/pngminim/encoder/makefile b/contrib/pngminim/encoder/makefile
index ef71f8a8e..a742e561e 100644
--- a/contrib/pngminim/encoder/makefile
+++ b/contrib/pngminim/encoder/makefile
@@ -4,8 +4,10 @@
 #CC=cc
 CC=gcc
 LD=$(CC)
+STRIP=strip
 
 RM=rm -f
+COPY=cp
 
 CFLAGS=-DPNG_USER_CONFIG -DNO_GZIP -I. -O1
 
@@ -14,13 +16,62 @@ O=.o
 L=.a
 E=
 
+# Where to find the source code:
+PNGSRC =../../..
+ZLIBSRC=$(PNGSRC)/../zlib
+PROGSRC=$(PNGSRC)/contrib/pngminus
+
+# Zlib
+ZSRCS  = adler32$(C) compress$(C) crc32$(C) deflate$(C) \
+	 trees$(C) zutil$(C)
+
+# Standard headers
+#ZH     = zlib.h crc32.h deflate.h trees.h zutil.h
+ZH     = zlib.h crc32.h deflate.h trees.h zutil.h
+
+# Machine generated headers
+ZCONF  = zconf.h
+
+# Headers callers use
+ZINC   = zlib.h $(ZCONF)
+
+# Headers the Zlib source uses
+ZHDRS  = $(ZH) $(ZCONF)
+
+# compress is not required; it is needed to link the zlib
+# code because deflate defines an unused API function deflateBound
+# which itself calls compressBound from compress.
 ZOBJS  = adler32$(O) compress$(O) crc32$(O) deflate$(O) \
 	 dummy_inflate$(O) \
-	 trees$(O) uncompr$(O) zutil$(O)
+	 trees$(O) zutil$(O)
 
-OBJS  = pnm2pngm$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
+# libpng
+PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
+	pngset$(C) pngtrans$(C) pngwio$(C) pngwrite$(C) \
+	pngwtran$(C) pngwutil$(C)
+
+# Standard headres
+PNGH   =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
+
+# Machine generated headers
+PNGCONF=pnglibconf.h
+
+# Headers callers use
+PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
+
+# Headers the PNG library uses
+PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
+
+PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
 	pngset$(O) pngtrans$(O) pngwio$(O) pngwrite$(O) \
-	pngwtran$(O) pngwutil$(O) $(ZOBJS)
+	pngwtran$(O) pngwutil$(O)
+
+PROGSRCS= pnm2pngm$(C)
+PROGHDRS=
+PROGDOCS=
+PROGOBJS= pnm2pngm$(O)
+
+OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
 
 # implicit make rules -------------------------------------------------------
 
@@ -33,18 +84,63 @@ all: pnm2pngm$(E)
 
 pnm2pngm$(E): $(OBJS)
 	$(LD) -o pnm2pngm$(E) $(OBJS)
-	strip pnm2pngm$(E)
+	$(STRIP) pnm2pngm$(E)
 
-pnglibconf.h: scripts/pnglibconf.mak scripts/pnglibconf.dfa scripts/options.awk pngusr.h
-	rm -f pnglibconf.h
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak CPPFLAGS=-DPNG_USER_CONFIG $@
+# The DFA_XTRA setting turns all libpng options off then
+# turns on those required for this minimal build.
+# The CPP_FLAGS setting causes pngusr.h to be included in
+# both the build of pnglibconf.h and, subsequently, when
+# building libpng itself.
+$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak\
+	$(PNGSRC)/scripts/pnglibconf.dfa \
+	$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
+	$(RM) pnglibconf.h pnglibconf.dfn
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG"\
+	    DFA_XTRA="pngusr.dfa" $@
 
 clean:
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak clean
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) clean
 	$(RM) pnm2pngm$(O)
 	$(RM) pnm2pngm$(E)
 	$(RM) $(OBJS)
 
-$(OBJS): png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h  pngusr.h zlib.h
+# distclean also removes the copied source and headers
+distclean: clean
+	$(RM) -r scripts # historical reasons
+	$(RM) $(PNGSRCS) $(PNGH)
+	$(RM) $(ZSRCS) $(ZH) $(ZCONF)
+	$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
+
+# Header file dependencies:
+$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
+$(PNGOBJS): $(PNGHDRS) $(ZINC)
+$(ZOBJS): $(ZHDRS)
+
+# Gather the source code from the respective directories
+$(PNGSRCS) $(PNGH): $(PNGSRC)/$@
+	$(RM) $@
+	$(COPY) $(PNGSRC)/$@ $@
+
+# No dependency on the ZLIBSRC target so that it only needs
+# to be specified once.
+$(ZSRCS) $(ZH):
+	$(RM) $@
+	$(COPY) $(ZLIBSRC)/$@ $@
+
+# The unconfigured zconf.h varies in name according to the
+# zlib release
+$(ZCONF):
+	$(RM) $@
+	@for f in zconf.h.in zconf.in.h zconf.h; do\
+	    test -r $(ZLIBSRC)/$$f &&\
+	    echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
+	    $(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
+	done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
+
+pnm2pngm.c: $(PROGSRC)/pnm2png.c
+	$(RM) $@
+	$(COPY) $(PROGSRC)/pnm2png.c $@
 
 # End of makefile for pnm2pngm
diff --git a/contrib/pngminim/encoder/pngusr.dfa b/contrib/pngminim/encoder/pngusr.dfa
new file mode 100644
index 000000000..d596f13c2
--- /dev/null
+++ b/contrib/pngminim/encoder/pngusr.dfa
@@ -0,0 +1,24 @@
+# pngminim/encoder/pngusr.dfa
+#
+# Copyright (c) 2010 Glenn Randers-Pehrson
+#
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+# First all the build options off:
+everything = off
+
+# Switch on the write code - this makes a minimalist encoder
+option WRITE on
+
+# You must choose fixed or floating point arithmetic:
+option FLOATING_POINT on
+# option FIXED_POINT on
+
+# Your program will probably need other options.  The example
+# program here, pnm2pngm, requires the following.  Take a look
+# at pnglibconf.h to find out the full set of what has to be
+# enabled to make the following work.
+option SETJMP on
+option STDIO on
diff --git a/contrib/pngminim/encoder/pngusr.h b/contrib/pngminim/encoder/pngusr.h
index c99e05a52..bba3fbaee 100644
--- a/contrib/pngminim/encoder/pngusr.h
+++ b/contrib/pngminim/encoder/pngusr.h
@@ -12,64 +12,17 @@
 #ifndef MINWRPNGCONF_H
 #define MINWRPNGCONF_H
 
-#define PNG_USER_PRIVATEBUILD "PNG minimal build"
-#define PNG_USER_DLLFNAME_POSTFIX "MN"
-
-#define PNG_NO_READ_SUPPORTED
+/* If pngusr.h is included during the build the following must
+ * be defined either here or in the .dfa file (pngusr.dfa in
+ * this case).  To include pngusr.h set -DPNG_USER_CONFIG in
+ * CPPFLAGS
+ */
+#define PNG_USER_PRIVATEBUILD "libpng minimal conformant PNG encoder"
+#define PNG_USER_DLLFNAME_POSTFIX "me"
 
+/* List options to turn off features of the build that do not
+ * affect the API (so are not recorded in pnglibconf.h)
+ */
 #define PNG_NO_WARNINGS
-#define PNG_NO_ERROR_TEXT
-
-#define PNG_NO_WRITE_BACKGROUND
-#define PNG_NO_WRITE_BGR
-#define PNG_NO_WRITE_GAMMA
-#define PNG_NO_WRITE_QUANTIZE
-#define PNG_NO_WRITE_INVERT
-#define PNG_NO_WRITE_SHIFT
-#define PNG_NO_WRITE_PACK
-#define PNG_NO_WRITE_PACKSWAP
-#define PNG_NO_WRITE_FILLER
-#define PNG_NO_WRITE_SWAP
-#define PNG_NO_WRITE_SWAP_ALPHA
-#define PNG_NO_WRITE_INVERT_ALPHA
-#define PNG_NO_WRITE_RGB_TO_GRAY
-#define PNG_NO_WRITE_USER_TRANSFORM
-#define PNG_NO_WRITE_bKGD
-#define PNG_NO_WRITE_cHRM
-#define PNG_NO_WRITE_gAMA
-#define PNG_NO_WRITE_hIST
-#define PNG_NO_WRITE_iCCP
-#define PNG_NO_WRITE_oFFs
-#define PNG_NO_WRITE_pCAL
-#define PNG_NO_WRITE_pHYs
-#define PNG_NO_WRITE_sBIT
-#define PNG_NO_WRITE_sCAL
-#define PNG_NO_WRITE_sPLT
-#define PNG_NO_WRITE_sRGB
-#define PNG_NO_WRITE_TEXT
-#define PNG_NO_WRITE_tIME
-#define PNG_NO_WRITE_UNKNOWN_CHUNKS
-#define PNG_NO_WRITE_USER_CHUNKS
-#define PNG_NO_WRITE_EMPTY_PLTE
-#define PNG_NO_WRITE_OPT_PLTE
-#define PNG_NO_WRITE_FILTER
-#define PNG_NO_WRITE_WEIGHTED_FILTER
-#define PNG_NO_WRITE_INTERLACING_SUPPORTED
-#define PNG_NO_WRITE_FLUSH
-
-#define PNG_NO_INFO_IMAGE
-#define PNG_NO_IO_STATE
-#define PNG_NO_USER_MEM
-#define PNG_NO_FIXED_POINT_SUPPORTED
-#define PNG_NO_MNG_FEATURES
-#define PNG_NO_USER_TRANSFORM_PTR
-#define PNG_NO_HANDLE_AS_UNKNOWN
-#define PNG_NO_CONSOLE_IO
-#define PNG_NO_ZALLOC_ZERO
-#define PNG_NO_ERROR_NUMBERS
-#define PNG_NO_EASY_ACCESS
-#define PNG_NO_USER_LIMITS
-#define PNG_NO_SET_USER_LIMITS
-#define PNG_NO_TIME_RFC1123
 
 #endif /* MINWRPNGCONF_H */
diff --git a/contrib/pngminim/preader/README b/contrib/pngminim/preader/README
index 377d641ad..6bf1db05c 100644
--- a/contrib/pngminim/preader/README
+++ b/contrib/pngminim/preader/README
@@ -1,14 +1,15 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h
 
-To build a minimal read-only progressive decoder embedded libpng and
-zlib and with your system's X library, run
+The makefile builds a minimal read-only progressive decoder with
+embedded libpng, zlib and your system's X library.
 
-    gather.sh # to collect needed files from gregbook, libpng, and zlib
+Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
+on the make command line.
 
 Edit makefile if required, to find your X library and include files,
 then
     
-    make
+    make ZLIBSRC=directory
  
 If you prefer to use the shared libraries, go to contrib/gregbook
 and build the rpng2-x application there. 
diff --git a/contrib/pngminim/preader/gather.sh b/contrib/pngminim/preader/gather.sh
index bfb948ec5..e69de29bb 100755
--- a/contrib/pngminim/preader/gather.sh
+++ b/contrib/pngminim/preader/gather.sh
@@ -1,18 +0,0 @@
-test -n "${PNGSRC}" || PNGSRC=../../..
-cp "${PNGSRC}"/contrib/gregbook/rpng2-x.c .
-cp "${PNGSRC}"/contrib/gregbook/readpng2.[ch] .
-cp "${PNGSRC}"/contrib/gregbook/COPYING .
-cp "${PNGSRC}"/contrib/gregbook/LICENSE .
-cp "${PNGSRC}"/*.h .
-cp "${PNGSRC}"/*.c .
-rm example.c pngtest.c pngw*.c
-rm -f pnglibconf.h
-test -d scripts || mkdir scripts
-cp "${PNGSRC}"/scripts/pnglibconf.mak scripts
-cp "${PNGSRC}"/scripts/pnglibconf.dfa scripts
-cp "${PNGSRC}"/scripts/options.awk scripts
-# change the following if zlib is somewhere else
-test -n "${ZLIBSRC}" || ZLIBSRC="${PNGSRC}"/../zlib
-cp "${ZLIBSRC}"/*.h .
-cp "${ZLIBSRC}"/*.c .
-rm minigzip.c example.c compress.c deflate.c gz*
diff --git a/contrib/pngminim/preader/makefile b/contrib/pngminim/preader/makefile
index ecbfb0dfd..a47efeeab 100644
--- a/contrib/pngminim/preader/makefile
+++ b/contrib/pngminim/preader/makefile
@@ -4,8 +4,10 @@
 #CC=cc
 CC=gcc
 LD=$(CC)
+STRIP=strip
 
 RM=rm -f
+COPY=cp
 
 #XINC = -I/usr/include			# old-style, stock X distributions
 #XLIB = -L/usr/lib/X11 -lX11		#  (including SGI IRIX)
@@ -23,21 +25,68 @@ XLIB = -L/usr/X11R6/lib -lX11
 #LIBS = $(XLIB)
 LIBS = $(XLIB) -lm                      #platforms that need libm
 
-CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP \
-       -DdeflateParams\(a,b,c\)=Z_OK -I. $(XINC) -O1
+CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP -I. $(XINC) -O1
 
 C=.c
 O=.o
 L=.a
 E=
 
-ZOBJS  = adler32$(O) crc32$(O) \
-	 infback$(O) inffast$(O) inflate$(O) inftrees$(O) \
-	 trees$(O) uncompr$(O) zutil$(O)
+# Where to find the source code:
+PNGSRC =../../..
+ZLIBSRC=$(PNGSRC)/../zlib
+PROGSRC=$(PNGSRC)/contrib/gregbook
 
-OBJS  = rpng2-x$(O) readpng2$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
+# Zlib (minimal inflate requirements - crc32 is used by libpng)
+# zutil can be eliminated if you provide your own zcalloc and zcfree
+ZSRCS  = adler32$(C) crc32$(C) \
+	 inffast$(C) inflate$(C) inftrees$(C) \
+	 zutil$(C)
+
+# Standard headers
+ZH     = zlib.h crc32.h inffast.h inffixed.h \
+	 inflate.h inftrees.h zutil.h
+
+# Machine generated headers
+ZCONF  = zconf.h
+
+# Headers callers use
+ZINC   = zlib.h $(ZCONF)
+
+# Headers the Zlib source uses
+ZHDRS  = $(ZH) $(ZCONF)
+
+ZOBJS  = adler32$(O) crc32$(O) \
+	 inffast$(O) inflate$(O) inftrees$(O) \
+	 zutil$(O)
+
+# libpng
+PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
+	pngpread$(C) pngread$(C) pngrio$(C) pngrtran$(C) pngrutil$(C) \
+	pngset$(C) pngtrans$(C)
+
+# Standard headres
+PNGH   =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
+
+# Machine generated headers
+PNGCONF=pnglibconf.h
+
+# Headers callers use
+PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
+
+# Headers the PNG library uses
+PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
+
+PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
 	pngpread$(O) pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
-	pngset$(O) pngtrans$(O)  $(ZOBJS)
+	pngset$(O) pngtrans$(O)
+
+PROGSRCS= rpng2-x$(C) readpng2$(C)
+PROGHDRS= readpng2.h
+PROGDOCS= COPYING LICENSE
+PROGOBJS= rpng2-x$(O) readpng2$(O)
+
+OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
 
 # implicit make rules -------------------------------------------------------
 
@@ -46,22 +95,67 @@ OBJS  = rpng2-x$(O) readpng2$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
 
 # dependencies
 
-all: rpng2-x$(E)
+all: $(PROGDOCS) rpng2-x$(E)
 
 rpng2-x$(E): $(OBJS)
 	$(LD) -o rpng2-x$(E) $(OBJS) $(LIBS)
-	strip rpng2-x$(E)
+	$(STRIP) rpng2-x$(E)
 
-pnglibconf.h: scripts/pnglibconf.mak scripts/pnglibconf.dfa scripts/options.awk pngusr.h
-	rm -f pnglibconf.h
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak CPPFLAGS=-DPNG_USER_CONFIG $@
+# The DFA_XTRA setting turns all libpng options off then
+# turns on those required for this minimal build.
+# The CPP_FLAGS setting causes pngusr.h to be included in
+# both the build of pnglibconf.h and, subsequently, when
+# building libpng itself.
+$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak\
+	$(PNGSRC)/scripts/pnglibconf.dfa \
+	$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
+	$(RM) pnglibconf.h pnglibconf.dfn
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG"\
+	    DFA_XTRA="pngusr.dfa" $@
 
 clean:
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak clean
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) clean
 	$(RM) rpng2-x$(O)
 	$(RM) rpng2-x$(E)
 	$(RM) $(OBJS)
 
-$(OBJS): png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h  readpng2.h pngusr.h zlib.h
+# distclean also removes the copied source and headers
+distclean: clean
+	$(RM) -r scripts # historical reasons
+	$(RM) $(PNGSRCS) $(PNGH)
+	$(RM) $(ZSRCS) $(ZH) $(ZCONF)
+	$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
+
+# Header file dependencies:
+$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
+$(PNGOBJS): $(PNGHDRS) $(ZINC)
+$(ZOBJS): $(ZHDRS)
+
+# Gather the source code from the respective directories
+$(PNGSRCS) $(PNGH): $(PNGSRC)/$@
+	$(RM) $@
+	$(COPY) $(PNGSRC)/$@ $@
+
+# No dependency on the ZLIBSRC target so that it only needs
+# to be specified once.
+$(ZSRCS) $(ZH):
+	$(RM) $@
+	$(COPY) $(ZLIBSRC)/$@ $@
+
+# The unconfigured zconf.h varies in name according to the
+# zlib release
+$(ZCONF):
+	$(RM) $@
+	@for f in zconf.h.in zconf.in.h zconf.h; do\
+	    test -r $(ZLIBSRC)/$$f &&\
+	    echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
+	    $(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
+	done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
+
+$(PROGSRCS) $(PROGHDRS) $(PROGDOCS): $(PROGSRC)/$@
+	$(RM) $@
+	$(COPY) $(PROGSRC)/$@ $@
 
 # End of makefile for rpng2-x
diff --git a/contrib/pngminim/preader/pngusr.dfa b/contrib/pngminim/preader/pngusr.dfa
new file mode 100644
index 000000000..27b2b0947
--- /dev/null
+++ b/contrib/pngminim/preader/pngusr.dfa
@@ -0,0 +1,29 @@
+# pngminim/preader/pngusr.dfa
+#
+# Copyright (c) 2010 Glenn Randers-Pehrson
+#
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+# First all the build options off:
+everything = off
+
+# Just switch on the progressive read code
+option PROGRESSIVE_READ on
+
+# You must choose fixed or floating point arithmetic:
+option FLOATING_POINT on
+# option FIXED_POINT on
+
+# Your program will probably need other options.  The example
+# program here, rpng2-x, requires the following.  Take a look
+# at pnglibconf.h to find out the full set of what has to be
+# enabled to make the following work.
+option SETJMP on
+option STDIO on
+option READ_bKGD on
+option READ_GAMMA on
+option READ_EXPAND on
+option READ_16_TO_8 on
+option READ_GRAY_TO_RGB on
diff --git a/contrib/pngminim/preader/pngusr.h b/contrib/pngminim/preader/pngusr.h
index c36abb638..e10a14ef8 100644
--- a/contrib/pngminim/preader/pngusr.h
+++ b/contrib/pngminim/preader/pngusr.h
@@ -12,57 +12,17 @@
 #ifndef MINPRDPNGCONF_H
 #define MINPRDPNGCONF_H
 
-#define PNG_USER_PRIVATEBUILD "PNG minimal build"
-#define PNG_USER_DLLFNAME_POSTFIX "MN"
+/* If pngusr.h is included during the build the following must
+ * be defined either here or in the .dfa file (pngusr.dfa in
+ * this case).  To include pngusr.h set -DPNG_USER_CONFIG in
+ * CPPFLAGS
+ */
+#define PNG_USER_PRIVATEBUILD "libpng minimal conformant PNG progressive reader"
+#define PNG_USER_DLLFNAME_POSTFIX "mp"
 
+/* List options to turn off features of the build that do not
+ * affect the API (so are not recorded in pnglibconf.h)
+ */
 #define PNG_NO_WARNINGS
-#define PNG_NO_ERROR_TEXT
-#define PNG_NO_READ_INT_FUNCTIONS
-
-#define PNG_NO_READ_BGR
-#define PNG_NO_READ_QUANTIZE
-#define PNG_NO_READ_INVERT
-#define PNG_NO_READ_SHIFT
-#define PNG_NO_READ_PACK
-#define PNG_NO_READ_PACKSWAP
-#define PNG_NO_READ_FILLER
-#define PNG_NO_READ_SWAP
-#define PNG_NO_READ_SWAP_ALPHA
-#define PNG_NO_READ_INVERT_ALPHA
-#define PNG_NO_READ_RGB_TO_GRAY
-#define PNG_NO_READ_USER_TRANSFORM
-#define PNG_NO_READ_cHRM
-#define PNG_NO_READ_hIST
-#define PNG_NO_READ_iCCP
-#define PNG_NO_READ_pCAL
-#define PNG_NO_READ_pHYs
-#define PNG_NO_READ_sBIT
-#define PNG_NO_READ_sCAL
-#define PNG_NO_READ_sPLT
-#define PNG_NO_READ_TEXT
-#define PNG_NO_READ_tIME
-#define PNG_NO_READ_UNKNOWN_CHUNKS
-#define PNG_NO_READ_USER_CHUNKS
-#define PNG_NO_READ_EMPTY_PLTE
-#define PNG_NO_READ_OPT_PLTE
-#define PNG_NO_READ_STRIP_ALPHA
-#define PNG_NO_READ_oFFs
-
-#define PNG_NO_WRITE_SUPPORTED
-
-#define PNG_NO_INFO_IMAGE
-#define PNG_NO_IO_STATE
-#define PNG_NO_USER_MEM
-#define PNG_NO_FIXED_POINT_SUPPORTED
-#define PNG_NO_MNG_FEATURES
-#define PNG_NO_USER_TRANSFORM_PTR
-#define PNG_NO_HANDLE_AS_UNKNOWN
-#define PNG_NO_CONSOLE_IO
-#define PNG_NO_ZALLOC_ZERO
-#define PNG_NO_ERROR_NUMBERS
-#define PNG_NO_EASY_ACCESS
-#define PNG_NO_USER_LIMITS
-#define PNG_NO_SET_USER_LIMITS
-#define PNG_NO_TIME_RFC1123
 
 #endif /* MINPRDPNGCONF_H */