Following a discussion i've just had on #gentoo-chat, and based on my own experience when i was new to Gentoo, i'd like to suggest that a definition of "global USE flag" and "local USE flags" be added to the relevant pages on packages.gentoo.org. For example, the top of https://packages.gentoo.org/useflags/global could say something like (as per https://devmanual.gentoo.org/general-concepts/use-flags/index.html): "A global USE flag is one defined by Gentoo as applicable to many different packages - typically at least 5 - and has a general non-specific purpose." While at the top of the https://packages.gentoo.org/useflags/local page, it could say something like: "A local USE flag is one that is defined per-package by the maintainer, in the metadata.xml for the ebuild, and is not necessarily applicable to other packages." The intent is to avoid users assuming that, for example, 'global' refers to USE flag settings they're applying system-wide, and that 'local' refers to USE flag settings they're applying per-package via package.use. Reproducible: Always
