pyyaml: Build error with setuptools 0.68.0

I think this might be caused from an inadvertent upgrade in my system of virtualenv from 20.23.1 to 20.24.0, which included an upgrade of setuptools from 67.8 to 68.

This was with Alpine (and Python 3.11.4) but the problem seems to be setuptools 68:

  ChefBuildError

[2023-07-17T15:25:18.341Z]   Backend subprocess exited when trying to invoke get_requires_for_build_wheel
  
  running egg_info
  writing lib/PyYAML.egg-info/PKG-INFO
  writing dependency_links to lib/PyYAML.egg-info/dependency_links.txt
  writing top-level names to lib/PyYAML.egg-info/top_level.txt
  Traceback (most recent call last):
    File "/usr/local/lib/python3.11/site-packages/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
      main()
    File "/usr/local/lib/python3.11/site-packages/pyproject_hooks/_in_process/_in_process.py", line 335, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/usr/local/lib/python3.11/site-packages/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
      return hook(config_settings)
             ^^^^^^^^^^^^^^^^^^^^^
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/build_meta.py", line 341, in get_requires_for_build_wheel
      return self._get_build_requires(config_settings, requirements=['wheel'])
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/build_meta.py", line 323, in _get_build_requires
      self.run_setup()
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/build_meta.py", line 338, in run_setup
      exec(code, locals())
    File "<string>", line 288, in <module>
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/__init__.py", line 107, in setup
      return distutils.core.setup(**attrs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/_distutils/core.py", line 185, in setup
      return run_commands(dist)
             ^^^^^^^^^^^^^^^^^^
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/_distutils/core.py", line 201, in run_commands
      dist.run_commands()
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 969, in run_commands
      self.run_command(cmd)
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/dist.py", line 1234, in run_command
      super().run_command(command)
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
      cmd_obj.run()
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/command/egg_info.py", line 314, in run
      self.find_sources()
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/command/egg_info.py", line 322, in find_sources
      mm.run()
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/command/egg_info.py", line 551, in run
      self.add_defaults()
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/command/egg_info.py", line 589, in add_defaults
      sdist.add_defaults(self)
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/command/sdist.py", line 104, in add_defaults
      super().add_defaults()
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/_distutils/command/sdist.py", line 251, in add_defaults
      self._add_defaults_ext()
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/_distutils/command/sdist.py", line 336, in _add_defaults_ext
      self.filelist.extend(build_ext.get_source_files())
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "<string>", line 204, in get_source_files
    File "/tmp/tmp0l7lnl_n/.venv/lib/python3.11/site-packages/setuptools/_distutils/cmd.py", line 107, in __getattr__
      raise AttributeError(attr)
  AttributeError: cython_sources
  

  at /usr/local/lib/python3.11/site-packages/poetry/installation/chef.py:147 in _prepare
      143│ 
      144│                 error = ChefBuildError("\n\n".join(message_parts))
      145│ 
      146│             if error is not None:
    → 147│                 raise error from None
      148│ 
      149│             return path
      150│ 
      151│     def _prepare_sdist(self, archive: Path, destination: Path | None = None) -> Path:

Note: This error originates from the build backend, and is likely not a problem with poetry but with pyyaml (6.0) not supporting PEP 517 builds. You can verify this by running 'pip wheel --use-pep517 "pyyaml (==6.0)"'.