$(PYTHON_DIR)/vendor-packages/setuptools_scm/_integration/deprecation.py:7: UserWarning: setup.cfg: at [metadata] version = attr: ... is forcing setuptools to override the version setuptools-scm did already set When using setuptools-scm it's invalid to use setuptools dynamic version as well, please remove it. Setuptools-scm is responsible for setting the version, forcing setuptools to override creates errors. warnings.warn( py$(PYV): commands[0]> python -m pytest ============================= test session starts ============================== platform sunos5 -- Python $(PYTHON_VERSION).X -- $(@D)/.tox/py$(PYV)/bin/python cachedir: .tox/py$(PYV)/.pytest_cache rootdir: $(@D) configfile: pyproject.toml collecting ... collected 1 item tests/test_posix.py::test_get_shell[mapping0-result0] PASSED ======== 1 passed ======== py$(PYV): OK congratulations :)