How do you get GSSAPI to work?

I see that as of version 1.3.1 GSSAPI is apparently supported/works. However I cannot find any mention of it at all anywhere in the client, and I've been through every screen possible. So I went digging and I found this: python-nbxmpp!55 (merged) and TL;DR, I found in the README that you need an optional runtime component of python-gssapi for this to work apparently.

I'm not a developer and I don't know anything about Python. How do I get this optional runtime component so that GSSAPI will work?

I'm using Windows if that matters. Thanks in advance.