diff -aur old/src/wl/sys/wl_iw.h new/src/wl/sys/wl_iw.h
--- old/src/wl/sys/wl_iw.h	2010-12-15 02:58:07.000000000 +0100
+++ new/src/wl/sys/wl_iw.h	2010-12-25 18:17:01.826676379 +0100
@@ -15,6 +15,7 @@
 #ifndef _wl_iw_h_
 #define _wl_iw_h_
 
+#include <linux/semaphore.h>
 #include <linux/wireless.h>
 
 #include <typedefs.h>