use.desc says: nls - Add Native Language Support (using gettext - GNU locale utilities) In sys-apps/man-pages, the nls flag is not in any way related to gettext. Plus, its use is redundant with the L10N USE-expand variable. The flag should simply be dropped.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=ddbd0085b41957d5ab4392bff380ddac60c1f804 commit ddbd0085b41957d5ab4392bff380ddac60c1f804 Author: Mike Gilbert <floppym@gentoo.org> AuthorDate: 2020-04-08 20:51:31 +0000 Commit: Mike Gilbert <floppym@gentoo.org> CommitDate: 2020-04-08 20:54:18 +0000 sys-apps/man-pages: drop 'nls' USE flag Closes: https://bugs.gentoo.org/716726 Package-Manager: Portage-2.3.96_p4, Repoman-2.3.22_p1 Signed-off-by: Mike Gilbert <floppym@gentoo.org> .../man-pages/{man-pages-5.05-r1.ebuild => man-pages-5.05-r2.ebuild} | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)