Setuptools can't actually build yet. Maybe #71438 helps? According to upstream graalpython likely won't work with packages but let's see.

To do:

• setup hook for $PYTHONPATH. Don't want to add it to the interpreter because that would cause a rebuild. Hmm...
• sitecustomize.py needs to be copied in. That means we need to do a build anyway.

@volth while this was not ready yet I decided to get it in so it can incrementally be improved. In my previous comment I mentioned two items that need to be added to the derivation.

If I am correct a graal build does not take much time, it just takes a lot of memory. What do you suggest, perform a new build specifically for graalpython, or add these two items always? Note the setup hook can be undesirable.