diff -ur a/rtllib/rtllib.h b/rtllib/rtllib.h
--- a/rtllib/rtllib.h	2010-05-07 04:31:32.000000000 +0200
+++ b/rtllib/rtllib.h	2010-09-15 17:40:56.928368871 +0200
@@ -27,6 +27,7 @@
 #include <linux/kernel.h>   /* ARRAY_SIZE */
 #include <linux/version.h>
 #include <linux/module.h>
+#include <linux/semaphore.h>
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 #include <linux/jiffies.h>
 #else