--- a/src/newgrf_fsmports.h	Mon Aug 13 20:03:41 2007 +0000
+++ b/src/newgrf_fsmports.h	Mon Aug 13 20:07:52 2007 +0000
@@ -9,6 +9,7 @@
 #include "newgrf_cargo.h"
 #include "helpers.hpp"
 #include "sprite.h"
+#include "airport.h"
 
 enum FSMportClass {
 	SYSTEM_HIDDEN_CLASS = 0x53595354  ///< SYST is a hidden class for things like oilrigs that need FSMs, but should not appear in picker lists