They were only transitively brought by sphinx -> babel -> setuptools.

+ make PYTHON=/usr/bin/python3 build
Traceback (most recent call last):
  File "/builddir/build/BUILD/python-systemd-235/setup.py", line 2, in <module>
    from setuptools import setup, Extension
ModuleNotFoundError: No module named 'setuptools'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'setuptools'
/bin/sh: line 1: git: command not found
/usr/bin/python3 setup.py build_ext
Traceback (most recent call last):
  File "/builddir/build/BUILD/python-systemd-235/setup.py", line 2, in <module>
    from setuptools import setup, Extension
ModuleNotFoundError: No module named 'setuptools'
make: *** [Makefile:35: build] Error 1