How to properly configure standalone build

Hey,

building python standalone works just fine on macOS. I can't find a proper way to configure the distribution, however.
So when starting the interpreter `sysconfig.get_config_var('LIBDIR')` prints `/install/lib` - which breaks with lots of tools that rely on a proper sysconfig (e.g. pybind11). The distribution contains the `makesetup` but not the makefile template, for example.

Clearly, I must be missing something :-)

Thanks a lot for your help