diff -Nurb linux-2.6.22-510/include/linux/socket.h linux-2.6.22-520/include/linux/socket.h
--- linux-2.6.22-510/include/linux/socket.h	2007-07-08 19:32:17.000000000 -0400
+++ linux-2.6.22-520/include/linux/socket.h	2008-06-06 17:07:56.000000000 -0400
@@ -288,6 +288,8 @@
 #define SOL_TIPC	271
 #define SOL_RXRPC	272
 
+#define SO_SETXID	SO_PEERCRED
+
 /* IPX options */
 #define IPX_TYPE	1