Previous stable 1.42.4-r2 have IUSE=X, but all newer versions have IUSE=+X, including new stable 1.48.5. This may result in unintentional installation of X packages on servers, which is bad idea. Probably it makes sense to revert it back to IUSE=X.
In these newer versions it went from force-enabled by default (due to upstream, there's a leftover comment about stub in the ebuild) then to optional again, so +X was the continuation of this (not that I (personally) see an issue with using old behavior, most should still have their configurations based on that and X is set by desktop profiles).
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=f51a846692c7c4bfbbd9433479dbc596fd38fb5e commit f51a846692c7c4bfbbd9433479dbc596fd38fb5e Author: Matt Turner <mattst88@gentoo.org> AuthorDate: 2021-06-01 02:04:15 +0000 Commit: Matt Turner <mattst88@gentoo.org> CommitDate: 2021-06-01 02:15:46 +0000 x11-libs/pango: Don't enable USE=X by default Closes: https://bugs.gentoo.org/792936 Signed-off-by: Matt Turner <mattst88@gentoo.org> x11-libs/pango/pango-1.48.5.ebuild | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)