In the ebuild: use vdpau || myconf+=" --disable-vdpau" libav-0.8.2 # ./configure --help | grep vdpau --enable-vdpau enable VDPAU code The resulting libav libraries do not link against libvdpau.
Ebuild is correct, please disregard this bug. libav's configure detects libvdpau if it's installed. It seems that libav doesn't use the libvdpau library (but uses the headers), but it's probably best to leave libvdpau in RDEPEND.