Is app-crypt/gnupg on Portage or overlays?

I want to use multiple pgp key servers with the sks key server group witch imply gnupg-curl installation for the hkps protocol.

But I didn’t find gnupg-curl as an ebuild in Portage or, at least, as a USE flag of app-crypt/gnupg.

So what is the best solution? Using an overlay or compile it by myself?