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When PyPy introduced Python 3.8 support with version 7.3.6, they also
migrated to using CPython's directory layout [0]:
> The 3.8 package now uses the same layout as CPython, and many of the
PyPy-specific changes to `sysconfig`, `distutils.sysconfig`, and
`distutils.commands.install.py` have been removed. The stdlib now is
located in `<base>/lib/pypy3.8` on `posix` systems...
When we upgraded past this version and added Python 3.8 support [1], the
`sitePackages` value was never updated, leading `bootstrapped-pip` to fail
to build, because wheel was trying to be located in `$out/site-packages`,
when it was actually installed to `$out/lib/pypy3.8/site-packages`.
[0]: https://www.pypy.org/posts/2021/10/pypy-v736-release.html
[1]: eec28b8cfd