In tree version is outdated and has no maintainer. Last upstream release 2.5 is from 2013. Superseded by git. Open QA issues: deprecated EAPI, bug #522676 and bug #526284.
kill it
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=2b2b32f650e62f7d79df328657e2b3fae4a817c3