Portmaster issue "The value of DISTDIR cannot be empty" After FreeBSD 11 Upgrade
This one was rather obvious and therefore difficult to troubleshoot.
Problem
I did a binary upgrade of FreeBSD via freebsd-update, rebooted and then tried
portmaster -a. This resulted in:
The value of DISTDIR cannot be empty.
Resolution
What I should have done was run freebsd-update install again after the
reboot. The instructions clearly stated that. There is an argument to be made
for having something resembling an attention span.