Filipe Laíns <la...@riseup.net> added the comment:

FYI, I have change the implementation to split the extra install schemes and 
extra schemes activated on site. This still makes sense over sitecustomize 
because we want the packages to be included in site.getsitepackages -- we want 
the vendor packages to essentially be the same as site-packages.

I have also moved sysconfig._get_preferred_schemes to the vendor config, 
instead of asking distributors to patch sysconfig -- this is why I prefer 
having it as executable code, we customize using functions, etc.
https://docs.python.org/3.10/library/sysconfig.html#sysconfig._get_preferred_schemes

A config taking advantage of all these mechanisms should look like this:

```
EXTRA_INSTALL_SCHEMES = {
    'vendor': {
        'stdlib': '{installed_base}/{platlibdir}/python{py_version_short}',
        'platstdlib': '{platbase}/{platlibdir}/python{py_version_short}',
        'purelib': '{base}/lib/python{py_version_short}/vendor-packages',
        'platlib': 
'{platbase}/{platlibdir}/python{py_version_short}/vendor-packages',
        'include':
            '{installed_base}/include/python{py_version_short}{abiflags}',
        'platinclude':
            '{installed_platbase}/include/python{py_version_short}{abiflags}',
        'scripts': '{base}/bin',
        'data': '{base}',
    },
}

EXTRA_SITE_INSTALL_SCHEMES = [
    'vendor',
]

def get_preferred_schemes(...):
    ...
```

Do you have any thoughts on this?

----------

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<https://bugs.python.org/issue43976>
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