Fails to install inside a virtual environment

[kalinkochnev]

Hi. I was hoping to get some insight into why this package isn't able to be installed inside a virtual environment. I installed cython and numpy inside the virtual env, but this package fails to locate Cython if it is install via virtual environment. When installed system wide it appears to work.

Thanks so much.

Reproduce by

python3 -m venv env/
source env/bin/activate
pip3 install numpy Cython
git clone https://github.com/cambel/ur_ikfast.git
cd ur_ikfast/
pip3 install -e .

Error message

Installing build dependencies ... done
  Checking if build backend supports build_editable ... done
  Getting requirements to build editable ... error
  error: subprocess-exited-with-error
  
  × Getting requirements to build editable did not run successfully.
  │ exit code: 1
  ╰─> [23 lines of output]
      Traceback (most recent call last):
        File "/home/user/Coding/CoopPrinting/crm_ws/env/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
          main()
        File "/home/user/Coding/CoopPrinting/crm_ws/env/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/home/user/Coding/CoopPrinting/crm_ws/env/lib/python3.12/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 132, in get_requires_for_build_editable
          return hook(config_settings)
                 ^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-f7ziaywz/overlay/lib/python3.12/site-packages/setuptools/build_meta.py", line 483, in get_requires_for_build_editable
          return self.get_requires_for_build_wheel(config_settings)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-f7ziaywz/overlay/lib/python3.12/site-packages/setuptools/build_meta.py", line 334, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=[])
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-f7ziaywz/overlay/lib/python3.12/site-packages/setuptools/build_meta.py", line 304, in _get_build_requires
          self.run_setup()
        File "/tmp/pip-build-env-f7ziaywz/overlay/lib/python3.12/site-packages/setuptools/build_meta.py", line 522, in run_setup
          super().run_setup(setup_script=setup_script)
        File "/tmp/pip-build-env-f7ziaywz/overlay/lib/python3.12/site-packages/setuptools/build_meta.py", line 320, in run_setup
          exec(code, locals())
        File "<string>", line 3, in <module>
      ModuleNotFoundError: No module named 'Cython'
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build editable did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.

[cambel]

Hi @kalinkochnev,

I was able to reproduce the issue and it seems to be solved by installing the following packages locally on the virtual environment:

# In activated venv
python -m pip install --upgrade pip setuptools wheel