portage # grep opus -Ri media-video/vlc media-video/vlc/vlc-2.0.4.ebuild: mtp musepack ncurses neon ogg omxil opengl opus optimisememory oss png media-video/vlc/vlc-2.0.4.ebuild: opus? ( media-libs/opus ) media-video/vlc/metadata.xml: <flag name="opus">Support opus decoding via libopus.</flag> No use_enable opus in src_configure, USE="-opus" emerge vlc installs /usr/lib64/vlc/plugins/codec/libopus_plugin.so
You are absolutely right, fixed.