Created attachment 333236 [details] mediatomb-0.12.1-r4 REQUIRED_USE patch net-misc/mediatomb has a section in src_configure that deals with conflicting use flags ffmpeg, libextractor and thumbnail. I added this section when working on the initial MediaTomb ebuild. EAPI 4 wasn't available then. I have attached a patch which makes use of REQUIRED_USE to deal with these conflicting use flags. This results in a much simpler ebuild and no longer are configure options silently enabled/disabled.
Thanks, added to tree as part of rev 5.