AC_DEFUN([AX_SUBMODULE],

[

m4_if(m4_bregexp($2,|,choice),choice,

	[AC_ARG_WITH($1,

		[AS_HELP_STRING([--with-$1=$2],

				[Which $1 to use [default=$3]])])])

case "system" in

$2)

	AC_ARG_WITH($1_prefix,

		    [AS_HELP_STRING([--with-$1-prefix=DIR],

				    [Prefix of $1 installation])])

	AC_ARG_WITH($1_exec_prefix,

		    [AS_HELP_STRING([--with-$1-exec-prefix=DIR],

				    [Exec prefix of $1 installation])])

esac

m4_if(m4_bregexp($2,build,build),build,

	[AC_ARG_WITH($1_builddir,

		[AS_HELP_STRING([--with-$1-builddir=DIR],

				[Location of $1 builddir])])])

if test "x$with_$1_prefix" != "x" -a "x$with_$1_exec_prefix" = "x"; then

	with_$1_exec_prefix=$with_$1_prefix

fi

if test "x$with_$1_prefix" != "x" -o "x$with_$1_exec_prefix" != "x"; then

	if test "x$with_$1" != "x" -a "x$with_$1" != "xyes" -a "x$with_$1" != "xsystem"; then

		AC_MSG_ERROR([Setting $with_$1_prefix implies use of system $1])

	fi

	with_$1="system"

fi

if test "x$with_$1_builddir" != "x"; then

	if test "x$with_$1" != "x" -a "x$with_$1" != "xyes" -a "x$with_$1" != "xbuild"; then

		AC_MSG_ERROR([Setting $with_$1_builddir implies use of build $1])

	fi

	with_$1="build"

	$1_srcdir=`echo @abs_srcdir@ | $with_$1_builddir/config.status --file=-`

	AC_MSG_NOTICE($1 sources in $$1_srcdir)

fi

if test "x$with_$1_exec_prefix" != "x"; then

	export PKG_CONFIG_PATH="$with_$1_exec_prefix/lib/pkgconfig${PKG_CONFIG_PATH+:$PKG_CONFIG_PATH}"

fi

case "$with_$1" in

$2)

	;;

*)

	case "$3" in

	bundled)

		if test -d $srcdir/.git -a \

			-d $srcdir/$1 -a \

			! -d $srcdir/$1/.git; then

			AC_MSG_WARN([git repo detected, but submodule $1 not initialized])

			AC_MSG_WARN([You may want to run])

			AC_MSG_WARN([	git submodule init])

			AC_MSG_WARN([	git submodule update])

			AC_MSG_WARN([	sh autogen.sh])

		fi

		if test -f $srcdir/$1/configure; then

			with_$1="bundled"

		else

			with_$1="no"

		fi

		;;

	*)

		with_$1="$3"

		;;

	esac

	;;

esac

AC_MSG_CHECKING([which $1 to use])

AC_MSG_RESULT($with_$1)

])