gentoo-overlay/media-plugins/grilo-plugins/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<pkgmetadata>
	<herd>gnome</herd>
	<use>
		<flag name="tracker">Build support for content discovery using the
			<pkg>app-misc/tracker</pkg> indexer</flag>
		<flag name="upnp">Build support for UPnP devices using
			<pkg>net-libs/gupnp</pkg> and <pkg>net-libs/gupnp-av</pkg></flag>
		<flag name="vimeo">Build support for Vimeo content discovery using
			<pkg>net-libs/libsoup</pkg> and <pkg>dev-libs/libgcrypt</pkg></flag>
		<flag name="youtube">Build support for YouTube content discovery using
			<pkg>dev-libs/libgdata</pkg></flag>
	</use>
</pkgmetadata>