I'm having problems with xine-lib-1.1.1-r4.ebuild and my CN400 based Via chipset.
I have "via" set in VIDEO_CARDS, so that the modular xorg via driver and unchrome_dri.so get built correctly.
However, xine-lib-1.1.1-r4.ebuild links against libviaXvMC rather than libviaXvMCPro.
I guess it wouldn't be so bad if it didn't use VIDEO_CARDS to work out which library to link against, as it would then just use libXVMCW...
I'm having to use a hacked version in an overlay at the moment, which isn't ideal.
You should be able to set with package.use to disable VIDEO_CARDS support (and then link against libXvMCW). The problem with unichrome driver is that it's not present in stable version of xorg. When 7.0 will be stable, xine-lib will simply use always libXvMCW, in the mean time, unichrome also had some problems and I preferred to avoid it.
How do you disable VIDEO_CARDS using package.use?
I've read the man page, searched the forums, googled and tried a few alternatives, but the only way I can do it is:
VIDEO_CARDS="" emerge media-libs/xine-lib
IIRC what Jason said at that time, you can treat them as useflags, so put -video_cards_via there and should be it