wemux tries 'chmod 1777' but this does not work
A commit references this bug:
Date: Thu Oct 11 11:33:31 UTC 2018
New revision: 481814
Update wemux port to include latest bug fixes from another forked version of
it. This new fork also adds manpages.
The original author of this software is not maintaining it anymore. Your bug should have been fixed by a forked version. I have updated the port. Hope, it works.