libpng/configure.in

dnl -*- shell-script -*-
dnl
dnl Process this file with autoconf to produce a configure script.
dnl
dnl $Id: configure.in,v 1.7 2001/05/16 15:14:22 cmdjb Exp $
dnl
dnl Copyright 1998-2000 Dave Beckett, ILRT, University of Bristol
dnl http://purl.org/net/dajobe/
dnl

AC_REVISION($Revision: 1.7 $)
AC_INIT(pngmeta.c)
AM_INIT_AUTOMAKE(pngmeta, [1.11])
AC_PREREQ(2.12)

dnl Checks for programs.
AC_PROG_CC




# Allow use of libpng and zlib from raw distributions
AC_ARG_WITH(zlib,
[  --with-zlib=DIR         DIR is root for libz distribution])

if test "X$with_zlib" = "X"; then
  AC_MSG_CHECKING(for installed zlib)
  oLIBS="$LIBS"
  LIBS="$LIBS -lz"
  AC_TRY_LINK([#include <zlib.h>], [z_streamp zstream; char *s=zlibVersion();],
	      with_zlib=default
	      AC_MSG_RESULT(yes),
	      AC_MSG_RESULT(no))
  LIBS="$oLIBS"
else
  AC_MSG_CHECKING(for local copy of zlib distribution)
  AC_MSG_RESULT($with_zlib)
fi

if test "X$with_zlib" = "X"; then
  AC_MSG_CHECKING(for local copy of zlib distribution)
  for dir in zlib-[0-9]* zlib ../zlib-[0-9]* ../zlib; do
    if test -d $dir -a -f $dir/zlib.h; then
      with_zlib=$dir
      break
    fi
  done
  if test "X$with_zlib" != "X"; then
    AC_MSG_RESULT($with_zlib)
    ZLIB_INCLUDE=$with_zlib
  else
    AC_MSG_RESULT(no)
  fi
fi

if test $with_zlib != default; then
  LIBS="$LIBS -L$with_zlib"
  CFLAGS="$CFLAGS -I$with_zlib"
fi


AC_ARG_WITH(png,
[  --with-png=DIR          DIR is root for libpng distribution])

if test "X$with_png" = "X"; then
  AC_MSG_CHECKING(for installed libpng)
  oLIBS="$LIBS"
  LIBS="$LIBS -lpng"
  AC_TRY_LINK([#include <png.h>], [png_structp png_ptr; png_infop info_ptr;    info_ptr = png_create_info_struct(png_ptr); ],
	      with_png=default
	      AC_MSG_RESULT(yes),
              LIBS="$oLIBS"
	      AC_MSG_RESULT(no))
else
  AC_MSG_CHECKING(for local copy of libpng distribution)
  AC_MSG_RESULT($with_png)
fi

if test "X$with_png" = "X"; then
  AC_MSG_CHECKING(for local copy of libpng distribution)
  for dir in libpng-[0-9]* libpng ../libpng-[0-9]* ../libpng; do
    if test -d $dir -a -f $dir/png.h; then
      with_png=$dir
      break
    fi
  done
  if test "X$with_png" != "X"; then
    AC_MSG_RESULT($with_png)
    PNG_INCLUDE=$with_png
  else
    AC_MSG_RESULT(no)
  fi
fi

if test $with_png != default; then
  LIBS="$LIBS -L$with_png -lpng"
  CFLAGS="$CFLAGS -I$with_png"
fi


dnl Checks for libraries.

# Allow use of libpng and zlib from installed areas
AC_ARG_WITH(zlib_lib,
[  --with-zlib-lib=LIB     LIB is path to libz.a])
if test "X$with_zlib_lib" != "X"; then
  LIBS="$LIBS -L$with_zlib_lib"
fi

AC_CHECK_LIB(z, zlibVersion, [],
[ AC_MSG_ERROR(could not find libz)]
)

# libpng always needs this
LIBS="$LIBS -lm"

AC_ARG_WITH(png_lib,
[  --with-png-lib=LIB      LIB is path to libpng.a])
if test "X$with_png_lib" != "X"; then
  LIBS="$LIBS -L$with_png_lib"
fi

AC_CHECK_LIB(png, png_create_read_struct, [],
[ AC_MSG_ERROR(could not find libpng)]
)





dnl Checks for header files.
AC_ARG_WITH(png-includes,
[  --with-png-includes=DIR DIR is path where PNG header files can be found])

if test "X$with_png" = X; then
  AC_MSG_CHECKING(for location of png includes)
  if test "X$PNG_INCLUDE" = X; then
    if test "X$with_png_includes" != "X"; then
      PNG_INCLUDE=$with_png_includes
    fi
  fi
  if test ! -f "$PNG_INCLUDE/png.h"; then
    AC_MSG_ERROR(could not find png.h in $PNG_INCLUDE)
  fi
  if test ! -f "$PNG_INCLUDE/pngconf.h"; then
    AC_MSG_ERROR(could not find pngconf.h in $PNG_INCLUDE)
  fi

  AC_MSG_RESULT($PNG_INCLUDE)
  CFLAGS="-I$(PNG_INCLUDE) $(CFLAGS)"
fi


AC_ARG_WITH(zlib-includes,
[  --with-zlib-includes=DIR DIR is path where ZLIB header files can be found])
if test "X$with_zlib" = X; then
  AC_MSG_CHECKING(for location of zlib includes)
  if test "X$with_zlib_includes" != "X"; then
    ZLIB_INCLUDE=$with_zlib_includes
  fi
  if test ! -f "$ZLIB_INCLUDE/zlib.h"; then
    AC_MSG_ERROR(could not find zlib.h in $ZLIB_INCLUDE)
  fi
  if test ! -f "$ZLIB_INCLUDE/zconf.h"; then
    AC_MSG_ERROR(could not find zconf.h in $ZLIB_INCLUDE)
  fi

  AC_MSG_RESULT($ZLIB_INCLUDE)
  CFLAGS="-I$(PNG_INCLUDE) $(CFLAGS)"
fi



## I have no idea why autoconf makes me need to do this.
## Of course on M$DOS it should be .exe
EXEEXT=
AC_SUBST(EXEEXT)

dnl Checks for typedefs, structures, and compiler characteristics.

dnl Checks for library functions.
AC_CHECK_FUNCS([png_create_read_struct png_get_text])


AC_OUTPUT([Makefile config.h pngmeta.spec])