Document not supporting pre PEP-518 build systems and suggest workarounds

[gaborbernat]

Though we don't support setup.py bdist_wheel we should mention that if one ensures build-requires are present things "should work". But in such cases, the responsibility falls onto whoever does the build to ensure pyproject.toml is kept in sync with such dependencies.

[shankarj67]

Can I work on this issue?

[gaborbernat]

For sure 👍

[shankarj67]

Can you provide some pointers to what exactly I have to do?

[gaborbernat]

@shankarj67 sorry this is not a good first issue if you're not familiar with PEP-517/518 and the ecosystem; writing down the pointers is exactly the scope of this issue 👍

[gaborbernat]

Hello, a fix for this issue has been released via virtualenv 20.0.10; see https://pypi.org/project/virtualenv/20.0.10/ (https://virtualenv.pypa.io/en/latest/changelog.html#v20-0-10-2020-03-10). Please give a try and report back if your issue has not been addressed; if not, please comment here, and we'll reopen the ticket. We want to apologize for the inconvenience this has caused you and say thanks for having patience while we resolve the unexpected bugs with this new major release.