--- compat/compat-2.6.39.c.orig	2011-05-04 09:45:45.885000018 +0800
+++ compat/compat-2.6.39.c	2011-05-04 09:46:04.691000014 +0800
@@ -10,6 +10,7 @@
 
 #include <linux/compat.h>
 #include <linux/tty.h>
+#include <linux/sched.h>
 
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27))
 /*