[issue22490] Using realpath for __PYVENV_LAUNCHER__ makes Homebrew installs fragile

[Jason R. Coombs]

Jason R. Coombs added the comment:

I believe this behavior (presence of the __PYVENV_LAUNCHER__ and inheritance in child processes) continues to cause problems. See https://github.com/pypa/virtualenv/issues/845 for a simple reproducing of the issue, even on pip 6+.

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nosy: +jason.coombs

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<http://bugs.python.org/issue22490>
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