Translations:USE flag/35/en
From Gentoo Wiki
USE flags can change an array of package behavior. They often set compile-time options, though these configure options are not systematically exposed through USE flags - it's up to the package maintainers to decide what options are useful to provide as USE flags. USE flags can specify which optional libraries or utilities will be linked with a package, often determining dependencies. Another example of what USE flags can change is which files are included in an installation, such as whether documentation is provided or not.