"numa" USE flag is used in <sys-cluster/openmpi-4 (maybe in actually automagic way), but is not used in >=sys-cluster/openmpi-4 and should be dropped from IUSE.
Thanks, I caught that in the sci overlay but missed it here. Fixed.
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=b103390a2465b7b39bb17b219dcf1dad2bf92f4e commit b103390a2465b7b39bb17b219dcf1dad2bf92f4e Author: Justin Bronder <jsbronder@gentoo.org> AuthorDate: 2019-04-25 16:47:05 +0000 Commit: Justin Bronder <jsbronder@gentoo.org> CommitDate: 2019-04-25 16:47:21 +0000 sys-cluster/openmpi: drop unused numa flag Signed-off-by: Justin Bronder <jsbronder@gentoo.org> Package-Manager: Portage-2.3.62, Repoman-2.3.11