AIP does not build locally

[dpurp-db]

Hello,

I'm trying to build a local version of AIP, but it doesn't seem to build.

How to reproduce:

• Clone the git repo
• Navigate to the git repo
• Run ./serve per instructions on: https://github.com/aip-dev/google.aip.dev/blob/master/CONTRIBUTING.md
• Notice the follow error:

...
6.069   Installing build dependencies: started
9.339   Installing build dependencies: finished with status 'done'
9.340   Getting requirements to build wheel: started
9.481   Getting requirements to build wheel: finished with status 'error'
9.486   error: subprocess-exited-with-error
9.486
9.486   × Getting requirements to build wheel did not run successfully.
9.486   │ exit code: 1
9.486   ╰─> [48 lines of output]
9.486       running egg_info
9.486       writing lib3/PyYAML.egg-info/PKG-INFO
9.486       writing dependency_links to lib3/PyYAML.egg-info/dependency_links.txt
9.486       writing top-level names to lib3/PyYAML.egg-info/top_level.txt
9.486       Traceback (most recent call last):
9.486         File "/usr/local/lib/python3.8/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
9.486           main()
9.486         File "/usr/local/lib/python3.8/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
9.486           json_out['return_val'] = hook(**hook_input['kwargs'])
9.486         File "/usr/local/lib/python3.8/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
9.486           return hook(config_settings)
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 325, in get_requires_for_build_wheel
9.486           return self._get_build_requires(config_settings, requirements=['wheel'])
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 295, in _get_build_requires
9.486           self.run_setup()
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 311, in run_setup
9.486           exec(code, locals())
9.486         File "<string>", line 271, in <module>
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/__init__.py", line 103, in setup
9.486           return distutils.core.setup(**attrs)
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/_distutils/core.py", line 185, in setup
9.486           return run_commands(dist)
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/_distutils/core.py", line 201, in run_commands
9.486           dist.run_commands()
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/_distutils/dist.py", line 969, in run_commands
9.486           self.run_command(cmd)
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/dist.py", line 963, in run_command
9.486           super().run_command(command)
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
9.486           cmd_obj.run()
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/command/egg_info.py", line 321, in run
9.486           self.find_sources()
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/command/egg_info.py", line 329, in find_sources
9.486           mm.run()
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/command/egg_info.py", line 551, in run
9.486           self.add_defaults()
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/command/egg_info.py", line 589, in add_defaults
9.486           sdist.add_defaults(self)
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/command/sdist.py", line 112, in add_defaults
9.486           super().add_defaults()
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/_distutils/command/sdist.py", line 251, in add_defaults
9.486           self._add_defaults_ext()
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/_distutils/command/sdist.py", line 336, in _add_defaults_ext
9.486           self.filelist.extend(build_ext.get_source_files())
9.486         File "<string>", line 201, in get_source_files
9.486         File "/tmp/pip-build-env-b_d2cupu/overlay/lib/python3.8/site-packages/setuptools/_distutils/cmd.py", line 107, in __getattr__
9.486           raise AttributeError(attr)
9.486       AttributeError: cython_sources
9.486       [end of output]
9.486
9.486   note: This error originates from a subprocess, and is likely not a problem with pip.
9.487 error: subprocess-exited-with-error

[guilherme-ptml]

it works with requirements.txt: aip-site-generator==0.5.0. Broken from aip-site-generator==0.6.0