#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
-#include <linux/locks.h>
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
+#include <linux/locks.h> /* wait_on_buffer */
+#else
+#include <linux/buffer_head.h> /* wait_on_buffer */
+#endif
#include <linux/unistd.h>
#include <net/sock.h>
#include <linux/uio.h>