--- a/src/openttd.h	Mon Jun 18 08:17:31 2007 +0000
+++ b/src/openttd.h	Mon Jun 18 10:48:15 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