In a [recent update to setuptools](https://github.com/pypa/setuptools/commit/fc5c3083908170e1cbfd1dec91f87a3e2707e3fa) the [current approach to install Python packages](https://github.com/rock-core/autobuild/blob/65c11afe2e89148fb9616b132571d38821b6adfb/lib/autobuild/packages/python.rb#L43) was apparantly deprecated. Not sure about the actual immediate consequences. The command is still [somewhat maintained](https://setuptools.pypa.io/en/latest/history.html#v61-1-1) apparantly.