Testing in a clean up-to-date xenial container and snapcraft installed from git master using a virtualenv as described in HACKING file. The attached snapcraft.yaml fails to build with an error building the wheel for the python-package in the final part. Excerpt of error: ImportError: No module named 'pkg_resources.py31compat' ---------------------------------------- Failed building wheel for bitstring Running setup.py clean for bitstring Failed to build bitstring ERROR: Failed to build one or more wheels