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# SYNOPSIS
#
# AX_CHECK_LIBJPEG(required_version, lib_dir)
#
# DESCRIPTION
#
# Check whether the system has libjpeg version required_version.
#
# LAST MODIFICATION
#
# 2007-11-08
#
# COPYLEFT
#
# Copyright (c) 2006 Nicolas Calimet
#
# 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.
AC_DEFUN([AX_CHECK_LIBJPEG],
[
ax_check_libjpeg_save_cppflags="$CPPFLAGS"
ax_check_libjpeg_save_ldflags="$LDFLAGS"
if test x"$2" != x""; then
CPPFLAGS="-I$2/../include $CPPFLAGS"
LDFLAGS="-L$2 $LDFLAGS"
fi
# required numeric version (e.g. 6b -> 62)
ax_check_libjpeg_version_num=`echo $1 | tr [[a-i]] [[1-9]]`
# check the library
AC_SEARCH_LIBS(
[jpeg_std_error],
[jpeg],
[
# check include file
AC_CHECK_HEADER(
[jpeglib.h],
[
# check library version, update LIBS
if test x"$1" != x"$ax_check_libjpeg_version_num"; then
AC_MSG_CHECKING([for libjpeg version >= $1 ($ax_check_libjpeg_version_num)])
else
AC_MSG_CHECKING([for libjpeg version >= $1])
fi
AC_RUN_IFELSE(
[
AC_LANG_SOURCE(
[#include <stdio.h>
#include "jpeglib.h"
int main (void)
{
fprintf (stderr, "%d\n", JPEG_LIB_VERSION);
return 0;
}]
)
],
[
ax_check_libjpeg_version=`eval $ac_try 2>&1`
AX_COMPARE_VERSION([$ax_check_libjpeg_version], [ge], [$ax_check_libjpeg_version_num], [ax_check_libjpeg="ok"], [ax_check_libjpeg="bad"])
AC_MSG_RESULT([$ax_check_libjpeg_version, $ax_check_libjpeg])
],
[
ax_check_libjpeg="unknown"
AC_MSG_RESULT([$ax_check_libjpeg])
],
[AC_MSG_RESULT([cross-compiling, forced])]
) # AC_RUN_IFELSE
],
[ax_check_libjpeg="no headers"]
) # AC_CHECK_HEADER
],
[ax_check_libjpeg="not found"],
[]
) # AC_SEARCH_LIBS
if test x"$ax_check_libjpeg" != x"ok"; then
CPPFLAGS="$ax_check_libjpeg_save_cppflags"
LDFLAGS="$ax_check_libjpeg_save_ldflags"
fi
])
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