[issue40854] [Patch] Allow overriding sys.platlibdir

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

bpo-1294959 added sys.platlibdir and configure --with-platlibdir to use /usr/lib64 on Fedora and SuSE to Python 3.9.

The problem is that msg370655 use case seems to be a regression compared to Python 3.9. I now consider to backport the commit 8f023a2f664f902a3d0b7a6f64d63afc0d1c15ae to 3.9 since it looks like a fix part of bpo-1294959 rather than a bug fix.

I created PR 20725 to backport PyConfig.platlibdir and PYTHONPLATLIBDIR env var to Python 3.9.

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