--- configure.ac.old	2009-10-05 14:56:46.000000000 -0400
+++ configure.ac	2009-10-05 14:56:50.000000000 -0400
@@ -102,6 +102,9 @@
 MOZHOME=`${PKG_CONFIG} --variable=prefix mozilla-headless`"/lib/xulrunner-"`${PKG_CONFIG} --modversion mozilla-headless`
 AC_SUBST([MOZHOME])
 
+XUL_CFLAGS=`${PKG_CONFIG} --cflags libxul-headless`
+AC_SUBST([XUL_CFLAGS])
+
 AC_PATH_PROG(DBUSBINDINGTOOL, dbus-binding-tool)
 AC_PATH_PROG([GLIB_GENMARSHAL], [glib-genmarshal])