Index: configure.in
===================================================================
--- configure.in	(revision 2617)
+++ configure.in	(working copy)
@@ -28,7 +28,7 @@
 GCONF_REQUIRED=1.1.5
 LIBWNCK_REQUIRED=2.5.0
 LIBGTOP_REQUIRED=2.23.1
-GTK_REQUIRED=2.12.0
+GTK_REQUIRED=2.16.0
 GNOME_ICON_THEME_REQUIRED=2.15.3
 GTKMM_REQUIRED=2.8
 GIOMM_REQUIRED=2.16.0
Index: src/interface.cpp
===================================================================
--- src/interface.cpp	(revision 2617)
+++ src/interface.cpp	(working copy)
@@ -553,7 +553,7 @@
 	GtkAction *action;
 	char *message;
 
-	action = gtk_widget_get_action(GTK_WIDGET(proxy));
+	action = gtk_activatable_get_related_action (GTK_ACTIVATABLE(proxy));
 	g_assert(action);
 
 	g_object_get (G_OBJECT (action), "tooltip", &message, NULL);
