Revert "Use sitecustomize to emulate venv during python install" #520
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This reverts #512.
Fixes #518.
There is a conditional in
setuptools
that causes somesetup.cfg
options to be ignored while in a virtual environment. While their use is probably incorrect, the anitpattern is too widespread to ignore, and we can't see a way to avoid the conditional in setuptools while still using thesitecustomize
approach to work around the platform patches.This will regress colcon builds on Fedora 36, homebrew, and Jammy with
setuptools
installed from pip once again, until we can come up with a new solution.