--- a/src/openttd.h	Wed Jun 13 12:05:56 2007 +0000
+++ b/src/openttd.h	Tue Jun 19 07:21:01 2007 +0000
@@ -67,6 +67,7 @@
 typedef uint16 GroupID;
 typedef uint16 EngineRenewID;
 typedef uint16 DestinationID;
+typedef int32 CommandCost;
 
 /* DestinationID must be at least as large as every these below, because it can
  * be any of them