--- a/source.list	Thu May 08 13:21:55 2008 +0000
+++ b/source.list	Thu May 08 13:29:35 2008 +0000
@@ -384,6 +384,7 @@
 town_gui.cpp
 train_gui.cpp
 transparency_gui.cpp
+tree_gui.cpp
 vehicle_gui.cpp
 
 # Command handlers