dnl _GLIB_TRY_VERSION(min-version)
AC_DEFUN([_GLIB_TRY_VERSION], [dnl
sedhead='s/@<:@0-9@:>@@<:@0-9@:>@*/<<<&>>>/'
sedtail='s/.*<<<\(.*\)>>>.*/\1/;t;s/.*/0/'
glib_min_major=`printf   '%s' '$1' | sed -e "$sedhead"1 -e "$sedtail"`
glib_min_minor=`printf   '%s' '$1' | sed -e "$sedhead"2 -e "$sedtail"`
glib_min_release=`printf '%s' '$1' | sed -e "$sedhead"3 -e "$sedtail"`

AC_CACHE_CHECK([for glib version at least $1],
	[glib_cv_sufficient_ver],
	[AC_LINK_IFELSE([AC_LANG_PROGRAM([dnl
_GLIB_INCLUDES
#if !GLIB_CHECK_VERSION($glib_min_major,$glib_min_minor,$glib_min_release)
#  error Insufficient glib version
#endif
], [dnl
_GLIB_MAIN
])], [glib_cv_sufficient_ver=yes], [glib_cv_sufficient_ver=no])])
])

dnl _GLIB_MODULE([module-name], [module-list])
AC_DEFUN([_GLIB_MODULE], [ifelse(m4_bregexp([$2], [\(^\| \)$1\( \|$\)]), [-1],
[], [dnl

AC_ARG_VAR([LIB]m4_toupper([$1])[_CFLAGS],
	[C compiler flags for lib$1])
AC_ARG_VAR([LIB]m4_toupper([$1])[_LIBS],
	[linker flags for lib$1])

ifelse([$1], [gobject], [dnl
	m4_append([_GLIB_INCLUDES], [dnl
#include <glib-object.h>], [
])
	m4_append([_GLIB_MAIN], [dnl
g_type_init();
{ GObject *obj = g_object_new(G_TYPE_OBJECT, NULL); }], [
])
])

if test x"$PKG_CONFIG" != x; then
	AC_MSG_CHECKING([pkg-config database for $1-2.0])
	_PKG_CONFIG([lib$1_cflags], [cflags], [$1-2.0])
	_PKG_CONFIG([lib$1_libs],   [libs],   [$1-2.0])
	if test x$pkg_failed = xyes; then
		errors=`$PKG_CONFIG --errors-to-stdout --print-errors lib$1`
		echo "$errors" >&AS_MESSAGE_LOG_FD

		AC_MSG_RESULT([no])
	else
		if test x"$LIB[]m4_toupper([$1])_CFLAGS" = x; then
			LIB[]m4_toupper([$1])_CFLAGS=$pkg_cv_lib$1_cflags
		fi
		if test x"$LIB[]m4_toupper([$1])_LIBS" = x; then
			LIB[]m4_toupper([$1])_LIBS=$pkg_cv_lib$1_libs
		fi

		AC_MSG_RESULT([yes])
	fi
fi

GLIB_CFLAGS="$GLIB_CFLAGS $LIB[]m4_toupper([$1])_CFLAGS"
GLIB_LIBS="$GLIB_LIBS $LIB[]m4_toupper([$1])_LIBS"

])])

dnl CHECK_GLIB_2([min-version], [modules], [action-if-ok], [action-if-fail])
AC_DEFUN([CHECK_GLIB_2],
[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl

m4_define([_GLIB_INCLUDES], [#include <glib.h>])
m4_define([_GLIB_MAIN],     [const char *ver = glib_check_version(2,0,0);])

GLIB_CFLAGS=
GLIB_LIBS=

_GLIB_MODULE([glib], [glib])
_GLIB_MODULE([gobject], [$2])

AC_LANG_PUSH([C])
old_cflags=$CFLAGS
old_libs=$LIBS
CFLAGS="$GLIB_CFLAGS $CFLAGS"
LIBS="$GLIB_LIBS $LIBS"

_GLIB_TRY_VERSION(ifelse([$1], [], [2.0], [$1]))

CFLAGS=$old_cflags
LIBS=$old_libs
AC_LANG_POP([C])

if test x"$glib_cv_sufficient_ver" = x"yes"; then
	AC_SUBST([GLIB_CFLAGS])
	AC_SUBST([GLIB_LIBS])
	ifelse([$3], [], [:], [$3])
else
	ifelse([$4], [], [AC_MSG_FAILURE([dnl
glib version >= ifelse([$1], [], [2.0], [$1]) is required.  The latest
version can be obtained from ftp://ftp.gtk.org/pub/glib.

If libglib is installed but was not found by this configure script,
consider adjusting LIBGLIB_CFLAGS and/or LIBGLIB_LIBS as necessary.

If pkg-config is installed, it may help to adjust PKG_CONFIG_PATH
if libglib is installed in a non-standard prefix.
])], [$4])
fi
])