configure.in

dnl -*- shell-script -*-
dnl
dnl Process this file with autoconf to produce a configure script.
dnl
dnl $Source: /home/cur/djb1/develop/pngmeta/pngmeta/RCS/configure.in,v $
dnl
dnl $Id: configure.in,v 1.4 2000/01/31 13:52:24 djb1 Exp $
dnl
dnl (C) Copyright 1998, Dave Beckett, University of Kent at Canterbury
dnl

AC_REVISION($Revision: 1.4 $)
AC_INIT(pngmeta.c)
AM_INIT_AUTOMAKE(pngmeta, [1.10])
AC_PREREQ(2.12)

dnl Checks for programs.
AC_PROG_CC




# Allow use of libpng and zlib from raw distributions
PNG_INCLUDE=/usr/include # prefix?
AC_ARG_WITH(png,
[  --with-png=DIR          DIR is root for libpng distribution])

AC_MSG_CHECKING(for local copy of libpng distribution)
if test "X$with_png" = "X"; then
  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
      LIBS="$LIBS -lpng"
      break
    fi
  done
fi
if test "X$with_png" != "X"; then
  AC_MSG_RESULT($with_png)
  LDFLAGS="$LDFLAGS -L$with_png"
  PNG_INCLUDE=$with_png
else
  AC_MSG_RESULT(no)
fi


ZLIB_INCLUDE=/usr/include # prefix?
AC_ARG_WITH(zlib,
[  --with-zlib=DIR         DIR is root for libz distribution])

AC_MSG_CHECKING(for local copy of zlib distribution)
if test "X$with_zlib" = "X"; then
  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
      LIBS="$LIBS -lz"
      break
    fi
  done
fi
if test "X$with_zlib" != "X"; then
  AC_MSG_RESULT($with_zlib)
  LDFLAGS="$LDFLAGS -L$with_zlib"
  ZLIB_INCLUDE=$with_zlib
else
  AC_MSG_RESULT(no)
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$with_zlib_lib" != "X"; then
  LDFLAGS="$LDFLAGS -L$with_zlib_lib"
fi

AC_CHECK_LIB(z, zlibVersion, [LIBS="$LIBS -lz"],
[ 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$with_png_lib" != "X"; then
  LDFLAGS="$LDFLAGS -L$with_png_lib"
fi

AC_CHECK_LIB(png, png_create_read_struct, [LIBS="-lpng $LIBS"],
[ AC_MSG_ERROR(could not find libpng)]
)





dnl Checks for header files.
AC_MSG_CHECKING(for location of png includes)
AC_ARG_WITH(png-includes,
[  --with-png-includes=DIR DIR is path where PNG header files can be
                          found, defaults to /usr/include])
if test "X$with_png_includes" != "X"; then
  PNG_INCLUDE=$with_png_includes
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)
AC_SUBST(PNG_INCLUDE)


AC_MSG_CHECKING(for location of zlib includes)
AC_ARG_WITH(zlib-includes,
[  --with-zlib-includes=DIR DIR is path where ZLIB header files can be
                           found, defaults to /usr/include])
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)
AC_SUBST(ZLIB_INCLUDE)


## 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_OUTPUT(Makefile)