make sure ~/.cache/pip isn't used while installing Tkinter #1691
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I deliberately broke the use of
$HOME/.cache/pip
in my test account to catch occurrences wherepip
tries to use it (after we told it not to in #1687.Tkinter
installed failed because of that, with aPermission denied
on$HOME/.cache/pip/wheels
:which can be circumvented by pointing
$XDG_CACHE_HOME
to a temporary location