* '''<code>N</code>''' - Actualizar cualquier paquete que haya cambiado ('''nuevos''') ajustes USE.
You should also consider passing <code>--with-bdeps=y</code> when emerging @world, at least once in a while. This will update build dependencies as well.
Of course, sometimes we want to install a package but not add it to the <code>world</code> file. This is often done because you only want the package installed temporarily or because you know the package in question is a dependency of another package. If this behavior is desired, you call emerge like this: