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> Éric Araujo <merwok@netwok.org> added the comment:
> 2 and 3: Alexis most probably added that behavior as a convenience. Unless 
>I’m mistaken, the point of $TMP/$TMPDIR is that the OS itself will clean it up, 
>for example on shutdown, so programs that leave stuff here are not strictly 
>wrong. However, given the realities of Windows behavior (I recall seeing 
>"temporary" directories with tons of stuff never cleaned up) and the low cost 
>of a change ("It's not asking a lot to be given an explicit path to install to" 
>+1), my opinion is that we should take your patch as it is.
Great. Although /tmp is cleaned up on restart (on Linux at least), waiting for 
that can lead to problems. For example, I came across this problem when I (for 
test purposes) installed every single one of the 400+ packages on PyPI which 
claim to be Py3 compatible, into a virtual env, using "pysetup3 install". I then 
noticed some (slight) performance slowdown and sudden disappearance of free disk 
space ... it was all those archives (and their unpacked contents) in /tmp that 
was the reason.