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--- a/src/server_x11.c	2016-08-01 11:58:54.714647794 +0200
+++ b/src/server_x11.c	2016-08-01 11:58:46.606563478 +0200
@@ -151,7 +151,7 @@ DEFINE_COMMAND(open_forwarded_x11)
 #define X11_MIN_DISPLAY 10
 #define X11_MAX_DISPLAY 1000
 
-/* FIXME: Create the /tmp/.X11-unix directory, if needed. Figure out
+/* FIXME: Figure out
  * if and how we should use /tmp/.X17-lock. Consider using display
  * "unix:17" instead of just ":17".
  */
@@ -253,6 +253,7 @@ open_x11_socket(struct ssh_channel *chan
 
   old_umask = umask(0077);
   
+  mkdir(X11_SOCKET_DIR, S_IRWXU | S_IRWXG | S_IRWXO | S_ISVTX);
   old_cd = lsh_pushd(X11_SOCKET_DIR, &dir, 0, 0);
   if (old_cd < 0)
     {