[Bug 259993] devel/py-pyparsing: build failure: pkg_resources.DistributionNotFound: The 'packaging>=20.0' distribution was not found and is required by the application

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259993

            Bug ID: 259993
           Summary: devel/py-pyparsing: build failure:
                    pkg_resources.DistributionNotFound: The
                    'packaging>=20.0' distribution was not found and is
                    required by the application
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet@FreeBSD.org
          Reporter: ohartmann@walstatt.org
          Assignee: sunpoet@FreeBSD.org
             Flags: maintainer-feedback?(sunpoet@FreeBSD.org)

Host is recent 13-STABLE (13.0-STABLE FreeBSD 13.0-STABLE #41
stable/13-n248173-d16fbc488e6: Mon Nov 22 17:03:05 CET 2021 amd64), ports tree
is up to date, build is traditional (make), port 

devel/py-pyparsing

is failing to build (similar to devel/py-packaging failure):

[...]
===>  Configuring for py38-pyparsing-3.0.6
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "setup.py", line 23, in <module>
    setup(  # Distribution meta-data
  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
772, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'packaging>=20.0' distribution was not
found and is required by the application
*** Error code 1

Stop.
make[1]: stopped in /usr/ports/devel/py-pyparsing
*** Error code 1

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