diff -Naur openttd-1.1.1.orig/src/network/core/address.h openttd-1.1.1/src/network/core/address.h
--- openttd-1.1.1.orig/src/network/core/address.h	2011-01-22 09:53:15.000000000 +0000
+++ openttd-1.1.1/src/network/core/address.h	2011-07-23 22:43:03.000000000 +0000
@@ -17,6 +17,8 @@
 #include "../../string_func.h"
 #include "../../core/smallmap_type.hpp"
 
+#define AI_ADDRCONFIG 0x0020
+#define IPV6_V6ONLY 27
 #ifdef ENABLE_NETWORK
 
 class NetworkAddress;