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pip-installing this codebase fails

See original GitHub issue

I am on the latest Poetry version.
I have searched the issues of this repo and believe that this is not a duplicate.
If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

OS version and name: Ubuntu 18.04
Poetry version: from master (96191ca)
Link of a Gist with the contents of your pyproject.toml file: N/A

Issue

The following command fails in a new Python 3.6.8 env, with the latest pip, setuptools, and wheel (pip==20.0.2, setuptools==45.2.0, wheel==0.34.2).

pip install git+https://github.com/python-poetry/poetry

Command output

Collecting git+https://github.com/python-poetry/poetry
  Cloning https://github.com/python-poetry/poetry to /tmp/pip-req-build-6cd8p6hc
  Running command git clone -q https://github.com/python-poetry/poetry /tmp/pip-req-build-6cd8p6hc
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  ERROR: Command errored out with exit status 1:
   command: /[...]/.pyenv/versions/3.6.8/envs/test/bin/python3.6 /[...]/.pyenv/versions/3.6.8/envs/test/lib/python3.6/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /tmp/tmp61iyu9vu
       cwd: /tmp/pip-req-build-6cd8p6hc
  Complete output (36 lines):
  Traceback (most recent call last):
    File "[...]/.pyenv/versions/3.6.8/envs/test/lib/python3.6/site-packages/pip/_vendor/pep517/_in_process.py", line 257, in <module>
      main()
    File "[...]/.pyenv/versions/3.6.8/envs/test/lib/python3.6/site-packages/pip/_vendor/pep517/_in_process.py", line 240, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "[...]/.pyenv/versions/3.6.8/envs/test/lib/python3.6/site-packages/pip/_vendor/pep517/_in_process.py", line 91, in get_requires_for_build_wheel
      return hook(config_settings)
    File "/tmp/pip-build-env-ns_zen05/overlay/lib/python3.6/site-packages/intreehooks.py", line 53, in get_requires_for_build_wheel
      return self._backend.get_requires_for_build_sdist(config_settings)
    File "/tmp/pip-build-env-ns_zen05/overlay/lib/python3.6/site-packages/intreehooks.py", line 38, in _backend
      obj = self._module_from_dir(modname)
    File "/tmp/pip-build-env-ns_zen05/overlay/lib/python3.6/site-packages/intreehooks.py", line 25, in _module_from_dir
      mod = importlib.import_module(modname)
    File "[...]/.pyenv/versions/3.6.8/lib/python3.6/importlib/__init__.py", line 126, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "<frozen importlib._bootstrap>", line 994, in _gcd_import
    File "<frozen importlib._bootstrap>", line 971, in _find_and_load
    File "<frozen importlib._bootstrap>", line 941, in _find_and_load_unlocked
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "<frozen importlib._bootstrap>", line 994, in _gcd_import
    File "<frozen importlib._bootstrap>", line 971, in _find_and_load
    File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
    File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
    File "<frozen importlib._bootstrap_external>", line 678, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/tmp/pip-req-build-6cd8p6hc/poetry/masonry/__init__.py", line 10, in <module>
      from .builder import Builder
    File "/tmp/pip-req-build-6cd8p6hc/poetry/masonry/builder.py", line 1, in <module>
      from .builders.complete import CompleteBuilder
    File "/tmp/pip-req-build-6cd8p6hc/poetry/masonry/builders/__init__.py", line 1, in <module>
      from .complete import CompleteBuilder
    File "/tmp/pip-req-build-6cd8p6hc/poetry/masonry/builders/complete.py", line 6, in <module>
      from poetry.factory import Factory
    File "/tmp/pip-req-build-6cd8p6hc/poetry/factory.py", line 10, in <module>
      from clikit.api.io.io import IO
  ModuleNotFoundError: No module named 'clikit'
  ----------------------------------------
ERROR: Command errored out with exit status 1: /[...]/.pyenv/versions/3.6.8/envs/test/bin/python3.6 /[...]/.pyenv/versions/3.6.8/envs/test/lib/python3.6/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /tmp/tmp61iyu9vu Check the logs for full command output.