--- mozilla-firefox-2.0.ebuild	2006-10-24 23:17:48.291333808 -0500
+++ mozilla-firefox-2.0.ebuild-new	2006-10-25 09:22:47.711983080 -0500
@@ -75,6 +75,12 @@
 }
 
 pkg_setup(){
+	if ! built_with_use x11-libs/cairo X; then
+		eerror "Cairo is not built with X useflag."
+		eerror "Please add 'X' to your USE flags, and re-emerge cairo."
+		die "Cairo needs X"
+	fi
+
 	if use mozbranding; then
 		einfo "You are enabling official branding. You may not redistribute this build"
 		einfo "to any users on your network or the internet. Doing so puts yourself into"