[Bug 259912] devel/py-packaging: Fails to configure: pkg_resources.ContextualVersionConflict: (pyparsing 3.0.4 ... Requirement.parse('pyparsing<3,>=2.0.2')

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 21 Nov 2021 20:48:28 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259912

--- Comment #2 from Po-Chuan Hsieh <sunpoet@FreeBSD.org> ---
(In reply to O. Hartmann from comment #0)

Please make sure you're not using tools like portmaster!

And please test it with simple "make deinstall install". I'm sure this port
build fine.

AFAIK, the problem is caused by portmaster behavior. You build the new version
(supports pyparsing 3) with old version installed (do not support pyparsing 3).

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