I have updated the ebuild for dev-lang/clojure to work with the latest version - 1.9.0. I will attach it here Reproducible: Always I understand there isn't a maintainer available at the moment. I could be encouraged to be a proxy maintainer of this package as I don't expect it is very mainstream!
Created attachment 528164 [details] ebuild for dev-lang/clojure-1.9.0
The ebuild you've attached calls mvn, but maven was not declared as a dependency. It would be preferred if it was possible to compile with only ant.
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=51cf91ee7564002303e41374ca65641100a7f8cd
Many thanks! Sorry Jeffrey - I didn't get to the ebuild in time, but thanks for your advice.