--- configure.ac_orig	2014-04-28 01:51:17.419311470 +0200
+++ configure.ac	2014-04-28 01:52:25.842088562 +0200
@@ -2458,7 +2458,8 @@
 	XWAYLAND_SYS_LIBS="$XWAYLANDMODULES_LIBS $GLX_SYS_LIBS"
 	AC_SUBST([XWAYLAND_LIBS])
 	AC_SUBST([XWAYLAND_SYS_LIBS])
-	WAYLAND_SCANNER_RULES(['$(top_srcdir)/hw/xwayland'])
+	m4_ifdef([WAYLAND_SCANNER_RULES],
+		[WAYLAND_SCANNER_RULES(['$(top_srcdir)/hw/xwayland'])])
 fi