Translations:/etc/portage/package.use/12/en
From Gentoo Wiki
- https://packages.gentoo.org/useflags - USE flags on Gentoo Packages Database
- Portage man page
- Setting USE_EXPAND flags in package.use - blog post by Bernard Cafarelli
- Cleaning /etc/portage/package.* from unused entries
- Find obsolete USE flags in /etc/portage/package.use - Gentoo forums thread