diff -up libquicktime-1.1.5/utils/gtk/libquicktime_config.c.gtk libquicktime-1.1.5/utils/gtk/libquicktime_config.c
--- libquicktime-1.1.5/utils/gtk/libquicktime_config.c.gtk	2010-07-08 12:21:24.000000000 +0200
+++ libquicktime-1.1.5/utils/gtk/libquicktime_config.c	2010-07-08 12:22:45.000000000 +0200
@@ -112,8 +112,8 @@ static MainWindow * create_main_window()
                    G_CALLBACK(main_window_button_callback),
                    (gpointer)ret);
 
-  GTK_WIDGET_SET_FLAGS (ret->close_button, GTK_CAN_DEFAULT);
-  GTK_WIDGET_SET_FLAGS (ret->save_button, GTK_CAN_DEFAULT);
+  gtk_widget_set_can_default(GTK_WIDGET(ret->close_button), TRUE);
+  gtk_widget_set_can_default(GTK_WIDGET(ret->save_button), TRUE);
   
   gtk_widget_show(ret->close_button);
   gtk_widget_show(ret->save_button);
diff -up libquicktime-1.1.5/utils/gtk/lqt_gtk.c.gtk libquicktime-1.1.5/utils/gtk/lqt_gtk.c
--- libquicktime-1.1.5/utils/gtk/lqt_gtk.c.gtk	2010-07-08 12:27:26.000000000 +0200
+++ libquicktime-1.1.5/utils/gtk/lqt_gtk.c	2010-07-08 12:27:04.000000000 +0200
@@ -941,9 +941,9 @@ lqtgtk_create_codec_config_window(lqt_co
 		   G_CALLBACK(codec_config_window_button_callback),
 		   (gpointer)ret);
 
-  GTK_WIDGET_SET_FLAGS (ret->apply_button, GTK_CAN_DEFAULT);
-  GTK_WIDGET_SET_FLAGS (ret->close_button, GTK_CAN_DEFAULT);
-  GTK_WIDGET_SET_FLAGS (ret->restore_button, GTK_CAN_DEFAULT);
+  gtk_widget_set_can_default(GTK_WIDGET(ret->apply_button), TRUE);
+  gtk_widget_set_can_default(GTK_WIDGET(ret->close_button), TRUE);
+  gtk_widget_set_can_default(GTK_WIDGET(ret->restore_button), TRUE);
 
   gtk_widget_show(ret->apply_button);
   gtk_widget_show(ret->close_button);
@@ -1240,7 +1240,7 @@ lqtgtk_create_codec_info_window(const lq
   ret->mainbox = gtk_vbox_new(0, 10);
 
   ret->close_button = gtk_button_new_from_stock(GTK_STOCK_CLOSE);
-  GTK_WIDGET_SET_FLAGS (ret->close_button, GTK_CAN_DEFAULT);
+  gtk_widget_set_can_default(GTK_WIDGET(ret->close_button), TRUE);
 
   g_signal_connect(G_OBJECT(ret->close_button), "clicked",
                      G_CALLBACK(codec_info_window_button_callback),