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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_gd.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_GD
#
# DESCRIPTION
#
# Check for the gd library. (See http://www.boutell.com/gd/) If gd is
# found, the output variables GD_CFLAGS, GD_LDFLAGS and GD_LIBS will
# contain the compiler flags, linker flags and libraries necessary to use
# gd; otherwise, those variables will be empty. In addition, the symbol
# HAVE_GD is defined if the library is found, and the symbols HAVE_GD_GIF,
# HAVE_GD_JPEG and HAVE_GD_PNG are defined if the library supports
# creating images in gif, jpeg and png formats, respectively.
#
# The user may use --with-gd=no or --without-gd to skip checking for the
# library. (The default is --with-gd=yes.) If the library is installed in
# an unusual location, --with-gd=DIR will cause the macro to look for
# gdlib-config in DIR/bin or, failing that, for the headers and libraries
# in DIR/include and DIR/lib.
#
# Feedback welcome!
#
# LICENSE
#
# Copyright (c) 2008 Nick Markham <markhn@rpi.edu>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 11
AC_DEFUN([AX_CHECK_GD], [
AC_ARG_WITH(gd,
AS_HELP_STRING([--with-gd(=DIR)], [use the gd library (in DIR)]),,
with_gd=yes)
if test "$with_gd" != no; then
AC_PATH_PROG(GDLIB_CONFIG, gdlib-config, , [$with_gd/bin:$PATH])
if test -n "$GDLIB_CONFIG"; then
GD_CFLAGS=`$GDLIB_CONFIG --cflags`
GD_LDFLAGS=`$GDLIB_CONFIG --ldflags`
GD_LIBS=`$GDLIB_CONFIG --libs`
elif test -d "$with_gd"; then
GD_CFLAGS="-I$with_gd/include"
GD_LDFLAGS="-L$with_gd/lib"
AC_CHECK_LIB(z, inflateReset, GD_LIBS="-lz")
AC_CHECK_LIB(png, png_check_sig, GD_LIBS="-lpng $GD_LIBS", , $GD_LIBS)
fi
save_CFLAGS="$CFLAGS"
CFLAGS="$GD_CFLAGS $CFLAGS"
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$GD_LDFLAGS $LDFLAGS"
AC_CHECK_LIB(gd, gdImageCreate, [
AC_DEFINE(HAVE_GD, 1, [ Define if you have gd library. ])
AC_CHECK_LIB(gd, gdImageGif, AC_DEFINE(HAVE_GD_GIF, 1, [ Define if GD supports gif. ]), , "$GD_LIBS")
AC_CHECK_LIB(gd, gdImageJpeg, AC_DEFINE(HAVE_GD_JPEG, 1, [ Define if GD supports jpeg. ]), , "$GD_LIBS")
AC_CHECK_LIB(gd, gdImagePng, AC_DEFINE(HAVE_GD_PNG, 1, [ Define if GD supports png. ]), , "$GD_LIBS")
GD_LIBS="-lgd $GD_LIBS"
], with_gd=no, $GD_LIBS)
CFLAGS="$save_CFLAGS"
LDFLAGS="$save_LDFLAGS"
fi
if test "$with_gd" = "no"; then
GD_CFLAGS="";
GD_LDFLAGS="";
GD_LIBS="";
fi
AC_SUBST(GD_CFLAGS)
AC_SUBST(GD_LDFLAGS)
AC_SUBST(GD_LIBS)
])
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