--- a/vehicle.h	Sat Sep 17 13:57:01 2005 +0000
+++ b/vehicle.h	Sun Sep 18 20:56:44 2005 +0000
@@ -350,8 +350,8 @@
 Trackdir GetVehicleTrackdir(const Vehicle* v);
 
 /* returns true if staying in the same tile */
-bool GetNewVehiclePos(Vehicle *v, GetNewVehiclePosResult *gp);
-byte GetDirectionTowards(Vehicle *v, int x, int y);
+bool GetNewVehiclePos(const Vehicle *v, GetNewVehiclePosResult *gp);
+byte GetDirectionTowards(const Vehicle *v, int x, int y);
 
 #define BEGIN_ENUM_WAGONS(v) do {
 #define END_ENUM_WAGONS(v) } while ( (v=v->next) != NULL);