That is an issue because we are going to remove old versions in the near future because of them being vulnerable and dead for ages I neither see much action on migrating to webkitgtk4, and it seems to even being broken with gtk+-3.20 per: https://github.com/conformal/xombrero/issues/147 Maybe it is time to treeclean it :/
commit a39883d855635a828669996d7fa0fcd722d85db8 Author: Michał Górny <mgorny@gentoo.org> AuthorDate: Sat Jul 1 11:16:03 2017 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: Sat Jul 1 11:20:03 2017 www-client/xombrero: Remove last-rited pkg, #608626