--- 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)
     {

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<div class='path'>path: <a href='/guix/log/?id=8b2708a5660bd74a87c0247c43bdbba38632015a'>root</a>/<a href='/guix/log/gnu?id=8b2708a5660bd74a87c0247c43bdbba38632015a'>gnu</a>/<a href='/guix/log/gnu/packages?id=8b2708a5660bd74a87c0247c43bdbba38632015a'>packages</a>/<a href='/guix/log/gnu/packages/simulation.scm?id=8b2708a5660bd74a87c0247c43bdbba38632015a'>simulation.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/simulation.scm?id=8b2708a5660bd74a87c0247c43bdbba38632015a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-01-23 16:50:00 +0000'>2020-01-23</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=37bb0d1eafb3f08a204aed8c928cbf7cbc69cd19'>gnu: fenics: Update to 2019.1.0.post0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/simulation.scm (fenics): Update to 2019.1.0.post0.
[arguments]: In the 'pre-check' phase, add three more demos to the
list of demos that are skipped.
</span></span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2020-01-23 16:49:59 +0000'>2020-01-23</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=09ecd9a7944ca8af017a92228442d8ec84c15f58'>gnu: fenics-dolfin: Update to 2019.1.0.post0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/simulation.scm (fenics-dolfin): Update to 2019.1.0.post0.
[source](snippet): Remove three substitutions that are no longer needed.
[native-inputs]: Use compatible version of CATCH.
[arguments]: Use CMAKE version 3.15.5 to avoid EXCLUDE_FROM_ALL
regression.  See &lt;https://issues.guix.gnu.org/issue/38060&gt;.
</span></span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2020-01-23 16:49:58 +0000'>2020-01-23</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=ec8dff89804320ba9ac237b9e479dac8c217552e'>gnu: python-fenics-ffc: Update to 2019.1.0.post0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/simulation.scm (python-fenics-ffc): Update to 2019.1.0.post0.
</span></span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2020-01-23 16:49:58 +0000'>2020-01-23</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=4dfb22c1e3c48151a1236b54637a23843b484bdc'>gnu: python-fenics-fiat: Update to 2019.1.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/simulation.scm (python-fenics-fiat): Update to 2019.1.0.
</span></span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2020-01-23 16:49:57 +0000'>2020-01-23</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=def588d2508644b127c49cde192c791420e113f1'>gnu: python-fenics-ufl: Update to 2019.1.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/simulation.scm (python-fenics-ufl): Update to 2019.1.0.
</span></span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2020-01-23 16:49:41 +0000'>2020-01-23</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=236861847fdb098b43a99c61c562329a2fdc765c'>gnu: python-fenics-dijitso: Update to 2019.1.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/simulation.scm (python-fenics-dijitso): Update to 2019.1.0.
</span></span></td><td>Paul Garlick</td></tr>