[SOLVED] locating dependencies with portage.

[meton_magis]

I'm wondering if there is a way I can give a package as an argument, and have portage find what currently installed packages depend on a given file. something like

emerge --????? cups (for example, I never print off this computer, so would like to prune if possible.)

and have it tell me what package installed this (not in my world file, so I didn't do it.)

Thanks in advance.

[meton_magis]

Nevermind, I found it.

emerge gentoolkit
equery depends $PACKAGE