I'm sure someone familiar with this can provide a better explanation, but it's 
true that tmp (temporary) files are routinely deleted, either during the 
installation process or macOS after a week or so. Normally items in that area 
are either only needed by the installation process or downloaded there and then 
moved to their final location during installation. I would have to conclude 
that either something went wrong during installation or there is a step missing 
in a post-install script.

-Al-

> On Aug 28, 2019, at 14:46, Gregory Seidman 
> <gsslist+macpo...@anthropohedron.net> wrote:
> 
> I recently switched to using a MacPorts-installed xorg-server instead of
> downloading XQuartz separately; while I don't know if this issue is
> related, I didn't have the problem before switching. Since then I've
> noticed that after some number of days I can no longer make connections to
> the X server, though current connections are fine. I tracked it down to
> /tmp/.X11-unix going missing. I have since taken to moving /tmp/.X11-unix
> to /var/tmp/.X11-unix and leaving a symlink in /tmp, but that hasn't
> stopped the symlink from being removed. I can relink and everything is
> fine, but I'd really like to know why it keeps getting removed.
> 
> Can anyone offer any insight?
> 
> --Greg

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