Fix compilation by checking for gtk_container_class_set_template_from_string()

configure.ac

@@ -254,7 +254,7 @@ dnl ================================================================
 dnl Check for extra functions
 dnl ================================================================
 AC_CHECK_FUNCS(gtk_builder_add_from_resource)
-
+AC_CHECK_FUNCS(gtk_container_class_set_template_from_string)
 
 AC_SUBST([GLADE_PREFIX])
 

gladeui/glade-widget-adaptor.c

@@ -809,7 +809,9 @@ glade_widget_adaptor_set_template (GladeWidgetAdaptor *adaptor,
   /* Update container class template */
   object_type = glade_widget_adaptor_get_object_type (adaptor);
   klass = g_type_class_peek (object_type);
+#if HAVE_GTK_CONTAINER_CLASS_SET_TEMPLATE_FROM_STRING
   gtk_container_class_set_template_from_string (klass, priv->template_xml);
+#endif
   gwa_template_rebuild_objects (adaptor, object_type);
 }