AC_CONFIG_SRCDIR([midend.c])
AM_INIT_AUTOMAKE([foreign])
AC_PROG_CC
-AM_PATH_GTK_2_0([2.0.0])
+
+AC_ARG_WITH([gtk],
+ [AS_HELP_STRING([--with-gtk=VER],
+ [specify GTK version to use (`2' or `3')])],
+ [gtk_version_desired="$withval"],
+ [gtk_version_desired="any"])
+
+case "$gtk_version_desired" in
+ 2 | 3 | any) ;;
+ yes) gtk_version_desired="any" ;;
+ *) AC_ERROR([Invalid GTK version specified])
+esac
+
+gtk=none
+
+case "$gtk_version_desired:$gtk" in
+ 3:none | any:none)
+ ifdef([AM_PATH_GTK_3_0],[
+ AM_PATH_GTK_3_0([3.0.0], [gtk=3], [])
+ ],[AC_WARNING([generating configure script without GTK 3 autodetection])])
+ ;;
+esac
+
+case "$gtk_version_desired:$gtk" in
+ 2:none | any:none)
+ ifdef([AM_PATH_GTK_2_0],[
+ AM_PATH_GTK_2_0([2.0.0], [gtk=2], [])
+ ],[AC_WARNING([generating configure script without GTK 2 autodetection])])
+ ;;
+esac
+
+if test "$gtk" = "none"; then
+ AC_MSG_ERROR([cannot build without GTK 2 or GTK 3])
+fi
if test "x$GCC" = "xyes"; then
AC_MSG_CHECKING([for usable gcc warning flags])