On Sun, 24 Apr 2011 11:33:33 -0500 Jeremy Olexa wrote: > Would you mind changing your method to determine un-used USE flags? Is the problem that prefix is being omitted from IUSE? The EAPI 4 feature that would have allowed you to do that was dropped because of a lack of support in Portage. If you're using it in conditionals or in queries, you need to list it in IUSE. -- Ciaran McCreesh