--- mozconfig-v6.42.eclass.orig	2016-01-04 20:07:27.485085744 +0100
+++ mozconfig-v6.42.eclass	2016-01-04 20:09:05.846076775 +0100
@@ -113,7 +113,7 @@
 		IUSE+=" gtk3"
 	fi
 	RDEPEND+="
-	gtk3? ( >=x11-libs/gtk+-3.14.0:3 )"
+	gtk3? ( >=x11-libs/gtk+-3.14.0:3[X] )"
 fi
 if [[ -n ${MOZCONFIG_OPTIONAL_WIFI} ]]; then
 	if [[ ${MOZCONFIG_OPTIONAL_WIFI} = "enabled" ]]; then