![]() ![]() Since the most recent version of pip requires a recent version of setuptools, if you have an older version of setuptools installed on the system, pip install will fail due to the missing setuptools.build_meta:_legacy_ backend. The most common way I've seen this cause problems is with the new setuptools.build_meta:_legacy_ backend. It seems that if you create a virtualenv with -system-site-packages, the system packages (but not the user packages) will be on the PYTHONPATH in the PEP 517 isolated build environment that pip creates (it does not effect python -m pep517.build), and it seems they will be on there with higher precedence than the requirements installed in the build environment.
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