--- mfsmount/mfs_fuse.c.orig	2016-07-17 18:56:40.670701543 +0200
+++ mfsmount/mfs_fuse.c	2016-07-17 18:57:03.222961265 +0200
@@ -28,6 +28,7 @@
 #include "config.h"
 #endif
 
+#include <sys/file.h>		/* LOCK_UN */
 #include <fuse_lowlevel.h>
 #include <stdio.h>
 #include <stdlib.h>
