build failure with setuptools_scm 6.0.1 · Issue #541 - GitHub
Even after pinning, python-dateutil is bringing down 6.0.1 of setuptools_scm and thus breaking on Python 3.5. Trying to identify a way out. I don't know how much this helps, but in my case I was able to fork the package that was importing the wrong version (in your case, python-dateutil), fix the imported version in my forked repo, and then link to that forked package in my …