--- a/ui/gtk/toolkit.h	Tue Jan 26 20:06:16 2016 +0100
+++ b/ui/gtk/toolkit.h	Wed Jan 27 12:10:42 2016 +0100
@@ -52,6 +52,9 @@
     void          *finish_data;
 } UiJob;
 
+typedef enum UiOrientation UiOrientation;
+enum UiOrientation { UI_HORIZONTAL = 0, UI_VERTICAL };
+
 void ui_destroy_userdata(GtkWidget *object, void *userdata);
 
 void ui_set_active_window(UiObject *obj);