Hey mate, i forked your project with the intent of fixing a compat problem with a mod i develop, but i couldn't because there's missing dependencies (Specifically the jei decomp jar), could you possibly include that in the git, or a link to download that in the README.md? Thanks mate =D

The JEI decomp jar should be downloaded automatically when you run gradlew setupDecompWorkspace.
If that isn't happening for you, then I'm not sure what the problem is, and I don't know enough about gradle to be of any help.