--- src/tron/gCycle.h.orig	2007-10-02 18:18:27.000000000 +0200
+++ src/tron/gCycle.h	2007-10-02 18:18:51.000000000 +0200
@@ -40,6 +40,10 @@
 class gTextureCycle;
 class eSoundPlayer;
 class gSensor;
+class gCycle;
+class gPlayerWall;
+class gNetPlayerWall;
+class gDestination;
 
 // minimum time between two cycle turns
 extern REAL sg_delayCycle;