--- Extras/glui/GL/glui.h.org	2007-10-31 09:00:03.000000000 +0100
+++ Extras/glui/GL/glui.h	2008-02-11 22:07:19.000000000 +0100
@@ -321,6 +321,8 @@
 class GLUI_Scrollbar;
 class GLUI_Listbox;
 class GLUI_List;
+class GLUI_Rollout;
+class GLUI_Tree;
 
 
 /**