--- a/src/newgrf_fsmports.h	Sun Aug 05 23:43:56 2007 +0000
+++ b/src/newgrf_fsmports.h	Mon Aug 06 00:44:01 2007 +0000
@@ -103,7 +103,7 @@
 uint GetNumCustomFSMports(FSMportsClassID sclass);
 
 void SetCustomFSMportsSpec(FSMportsSpec *FSMPORTSspec);
-const FSMportsSpec *GetCustomFSMportsSpec(FSMportsClassID sclass, uint FSMports);
+FSMportsSpec *GetCustomFSMportsSpec(FSMportsClassID sclass, uint FSMports);
 const FSMportsSpec *GetCustomFSMportsSpecByGrf(uint32 grfid, byte localidx);
 
 /* Rotate a position depending on the FSM_orientation */