--- vinagre-0.4.ebuild	2008-01-30 09:49:09.152261234 +0530
+++ vinagre-0.4.ebuild	2008-01-30 10:43:47.000000000 +0530
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 # $Header: $
 
-inherit gnome2
+inherit gnome2 eutils
 
 DESCRIPTION="VNC Client for the GNOME Desktop"
 HOMEPAGE="http://www.gnome.org/projects/vinagre/"
@@ -29,6 +29,12 @@
 
 pkg_setup() {
 	G2CONF="${G2CONF} $(use_enable avahi)"
+
+	local fail="Re-emerge net-dns/avahi with USE gtk."
+	if use avahi && ! built_with_use net-dns/avahi gtk; then
+		eerror "${fail}"
+		die "${fail}"
+	fi
 }
 
 src_install() {