Hi again, > No, try > > git clone https://github.com/pypa/pep517.git > cd pep517 > pip wheel --use-pep517 -v . > > which has no setup.py and uses flit instead. pip can build it, because > it supports PEP 517-based builds. As I said, if we decide to keep it > bundled with our python package, there’s no good reason to choose > pypa-build. I now have a proof of concept for a pip-based python-build-system, see 1st patch. The changeset is quite small, but it does not handle testing at all right now. Note that alot of setuptools-based packages lack a dependency on python-wheel (2nd patch; pardon the whitespace errors), which is required when using pyproject.toml (and also declared there, but our Python importer cannot read that file yet). But – as expected – that’s really the only issue I’ve encountered while rebuilding alot of Python packages so far. Cheers, Lars