Qt4 is dead and going away. This project has not made any effort to port to Qt5, and seems to be inactive overall, but the dependency can be switched off to keep it in tree.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=3fb33290e85d90a6f6d0a0a68cb00cc243abc49f commit 3fb33290e85d90a6f6d0a0a68cb00cc243abc49f Author: Andreas Sturmlechner <asturm@gentoo.org> AuthorDate: 2018-01-22 18:28:10 +0000 Commit: Andreas Sturmlechner <asturm@gentoo.org> CommitDate: 2018-01-22 19:51:46 +0000 sci-libs/chemkit: Drop USE qt4 Closes: https://bugs.gentoo.org/644514 Package-Manager: Portage-2.3.20, Repoman-2.3.6 sci-libs/chemkit/chemkit-0.1-r2.ebuild | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-)