--- a/src/station_func.h	Fri May 23 23:02:13 2008 +0000
+++ b/src/station_func.h	Sat May 24 02:54:47 2008 +0000
@@ -47,5 +47,6 @@
 /* Check if a rail station tile is electrifiable. */
 bool IsStationTileElectrifiable(TileIndex tile);
 
+void UpdateAirportsNoise();
 
 #endif /* STATION_FUNC_H */