It seems the package
salt is missing the dependency
python2-futures. I determined this by installing salt and running
salt-call --local test.ping. I received a traceback with
ImportError: No module named concurrent.futures.
I’m not sure if this is the correct way to report such a thing of this nature in the Antergos community; in Arch I think I would open a bug in the tracker.
If there is further testing or research let me know. If there is public access to the pkgbuild I’d be happy to contribute.