This commit hardcoded the glx backend for libva to off to eliminate an annoying circular dependency.
Unfortunately, even though Gentoo trivially uses a different backend to eliminate the need for this library, most other distros still have it, and so running binaries compiled on other distros can be problematic. In my case specifically a video program that embeds a copy of ffmpeg.
Is it possible to get a USE flag for this? I'd rather not maintain my own fork of the ebuild for something so trivially simple, and there are enough bug reports on other distros that turned out to be this library missing for running things like Steam games that having it locked to off may cause more trouble than it solves in the long-run.
Steps to Reproduce:
1. Install media-libs/libva
libva-glx.so.2 is built but not installed.
libva-glx.so.2 should be installable if desired.