--- a/src/roadveh.h	Tue May 01 15:25:00 2007 +0000
+++ b/src/roadveh.h	Tue May 01 16:35:14 2007 +0000
@@ -40,6 +40,7 @@
 
 	const char *GetTypeString() { return "road vehicle"; }
 	void MarkDirty();
+	void UpdateDeltaXY(Direction direction);
 };
 
 #endif /* ROADVEH_H */