When running pip install --no-binary :all: importlib-metadata or even pip install --no-binary importlib-metadata importlib-metadata on Python 3.7, building fails due to a recursion error. That's because the latest setuptools_scm version introduced a dependency on importlib-metadata for python_version < "3.8".

Maybe, build-system requires should be changed to require an older setuptools_scm version for python_version < "3.8"?