Guest writes "Anyone who has used Gentoo to customize their system knows full well how much the USE flags come into play. Generally, setting the proper flags in make.conf will steer your install towards a common goal, but for some packages, it's just not enough.
There are a lot of packages that make use of local use flags, along with the global ones. Editing them individually can be a tedious process by manually putting category/application entries in your package.use. All of that is made much simpler though by a lesser-known tool called flagedit."