--- a/aircraft_gui.c	Mon Aug 14 11:44:19 2006 +0000
+++ b/aircraft_gui.c	Mon Aug 14 14:21:15 2006 +0000
@@ -23,6 +23,7 @@
 #include "airport.h"
 #include "vehicle_gui.h"
 #include "newgrf_engine.h"
+#include "date.h"
 
 /**
  * Draw the purchase info details of an aircraft at a given location.