The bad news is that the infinality repo has been dead for some weeks/months. The good news is there’s another repo you can use to easily get infinality fonts working on Fedora.
The Instructions are here:
He has a github repo. It is based on bohoomil’s github repo.
UPDATE: As of Fedora 25, I recommend instead using “fedora-better-fonts” by @silenc3r. More details here: https://github.com/silenc3r/fedora-better-fonts