PEP 517 and projects that can't install via wheels

Yes, I want to second this (not just clicking the “heart”). :slight_smile: I think you (Jeroen) have already gotten the message across that this is an important issue, so I don’t think you need to state that further. Regarding your point on the other issue of saying “must,” I’m not sure the particular wording really matters because the bigger issue is finding someone to do the work (or doing it yourself) even if we agree it should be done. We can’t command volunteers to do work.