Fix mishandling of TMPDIR #362
Merged
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TMPDIR is used on many system for the user's temporary dir. Overriding
it and deleting has unwanted consequence that any subsequent usage might
fail, e.g. on macOS this happens when trying to create FairMQ channels
which are backed by unix domain sockets in $TMPDIR. I suspect ROOT would
also have troubles with it for some operations, even on linux.