--- a/src/network/core/udp.h	Thu Jan 04 20:33:50 2007 +0000
+++ b/src/network/core/udp.h	Thu Jan 04 21:21:14 2007 +0000
@@ -5,6 +5,11 @@
 
 #ifdef ENABLE_NETWORK
 
+#include "os_abstraction.h"
+#include "game.h"
+#include "packet.h"
+#include "../../newgrf_config.h"
+
 /**
  * @file udp.h Basic functions to receive and send UDP packets.
  */