Supplied install script doesn't work under `venv`

[Deleted user]

Summary

I'm working with a PyCharm generated venv (3.8.5) and running install scripts supplied here doesn't work. The folder in site-packages has no real code in it.

When I run it from a normal terminal, that is Python 3.8.5 sans venv, it install an egg.
I don't think this is expected behaviour - I was expecting a wheel...

Diagnostics

Mac BigSur 11.3.1
Latest repository version 0.1.1rc8.