[Bug 259912] devel/py-packaging: @py38: configure failure

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259912

            Bug ID: 259912
           Summary: devel/py-packaging: @py38: configure failure
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet@FreeBSD.org
          Reporter: ohartmann@walstatt.org
          Assignee: sunpoet@FreeBSD.org
             Flags: maintainer-feedback?(sunpoet@FreeBSD.org)

Host:  FreeBSD 14.0-CURRENT #6 main-n250822-4fdc5b8494b4: Thu Nov 18 06:00:15
CET 2021 amd64

Rebuilding python38 and all installed py38- ports (llvm13 produces a
segmentation fault in dns/bind916 due to an undiscovered issue and so I decided
to portmaster -dfR dns/bind916 and portmaster -dfR devel/py-packaging) results
in the error shown bewlow:

[...]
===>  Configuring for py38-packaging-21.2_1
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "setup.py", line 40, in <module>
    setup(
  File "/usr/local/lib/python3.8/site-packages/setuptools/__init__.py", line
153, in setup
    return distutils.core.setup(**attrs)
  File "/usr/local/lib/python3.8/distutils/core.py", line 108, in setup
    _setup_distribution = dist = klass(attrs)
  File "/usr/local/lib/python3.8/site-packages/setuptools/dist.py", line 455,
in __init__
    _Distribution.__init__(self, {
  File "/usr/local/lib/python3.8/distutils/dist.py", line 292, in __init__
    self.finalize_options()
  File "/usr/local/lib/python3.8/site-packages/setuptools/dist.py", line 800,
in finalize_options
    for ep in sorted(eps, key=by_order):
  File "/usr/local/lib/python3.8/site-packages/setuptools/dist.py", line 799,
in <lambda>
    eps = map(lambda e: e.load(), pkg_resources.iter_entry_points(group))
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line
2449, in load
    self.require(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line
2472, in require
    items = working_set.resolve(reqs, env, installer, extras=self.extras)
  File "/usr/local/lib/python3.8/site-packages/pkg_resources/__init__.py", line
777, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (pyparsing 3.0.4
(/usr/local/lib/python3.8/site-packages),
Requirement.parse('pyparsing<3,>=2.0.2'), {'packaging'})
*** Error code 1

Stop.
make: stopped in /usr/ports/devel/py-packaging

===>>> make build failed for devel/py-packaging@py38
===>>> Aborting update

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