--- a/src/rail_gui.h	Mon Apr 14 20:32:36 2008 +0000
+++ b/src/rail_gui.h	Tue Apr 15 00:47:19 2008 +0000
@@ -9,5 +9,6 @@
 
 void ShowBuildRailToolbar(RailType railtype, int button);
 void ReinitGuiAfterToggleElrail(bool disable);
+int32 ResetSignalVariant(int32 = 0);
 
 #endif /* RAIL_GUI_H */