Filip van den Bergh enlightened us with:
> Mythgallery and mythmusic failed to start on my system, which uses
> the TVout on a PVR 350 for X. Turns out they were both installed
> with a +opengl flag (using emerge -av myth...), a useless option if
> you use this TVout framebuffer. This option wasn't in my make.conf,
> so I'm guessing it is a requirement of the ebuild.

Don't guess. If it's an option, it's optional. Just add the packages
to /etc/portage/package.use, with the -opengl flag.

> I solved to problem itself by adding "-opengl" to my USE variable,

This will prevent all packages from adding OpenGL support. It's better
to add -opengl to specific packages only.

> so my question is not about solving the problem itself, but rather
> how to check for these added USE flags in portage, and when to
> decide something is a bug.

man emerge

Sybren
--
The problem with the world is stupidity. Not saying there should be a
capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself?