As stated in the title, www-client/firefox with USE="system-libevent" requires "threads" USE enabled on dev-libs/libevent but there're no such IUSE in any of libevent ebuilds. Therefore, build fails with the following message: emerge: there are no ebuilds built with USE flags to satisfy ">=dev-libs/libevent-2.0:0/2.1-7=[threads]". !!! One of the following packages is required to complete your request: - dev-libs/libevent-2.1.12-r1::gentoo (Missing IUSE: threads) (dependency required by "www-client/firefox-106.0.4::gentoo" [installed]) Reproducible: Always
That version isn't in tree anymore. The ones in tree have "threads(+)" to handle this.