Looks like the current tree ebuild is missing this.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=c28cc84413d90ca176801659c804ed667743a04d commit c28cc84413d90ca176801659c804ed667743a04d Author: Matt Turner <mattst88@gentoo.org> AuthorDate: 2018-03-06 20:24:34 +0000 Commit: Matt Turner <mattst88@gentoo.org> CommitDate: 2018-03-06 20:25:20 +0000 x11-base/xorg-server: Require libdrm-2.4.89 Closes: https://bugs.gentoo.org/649564 x11-base/xorg-server/xorg-server-1.19.99.901.ebuild | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)