gentoo-overlay/media-sound/rhythmbox/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>gnome</herd>
  <herd>gstreamer</herd>
  <use>
	<flag name="clutter">Build the visualizer plugin which uses
		<pkg>media-libs/clutter</pkg> and <pkg>x11-libs/mx</pkg></flag>
    <flag name="dbus">Allow the im-status plugin to set the status of your IM
    	clients using <pkg>dev-python/dbus-python</pkg></flag>
    <flag name="daap">Build the local network music sharing plugin which uses
		the DAAP protocol using <pkg>net-libs/libdmapsharing</pkg></flag>
  	<flag name="lastfm">Build a plugin for Last.fm and Librefm scrobbling</flag>
    <flag name="html">Use <pkg>net-libs/webkit-gtk</pkg> for detecting and
		displaying HTML podcast episode descriptions.</flag>
	<flag name="udev">Enable hardware detection via <pkg>sys-fs/udev</pkg>
		replacing the deprecated <pkg>sys-apps/hal</pkg> code</flag>
    <flag name="upnp">Build a plugin for local network music sharing which uses
		UPnP protocols using <pkg>media-video/coherence</pkg>,
		<pkg>dev-python/louie</pkg>, and <pkg>dev-python/twisted</pkg></flag>
	<flag name="webkit">Enable context panel plugin</flag>
	<flag name="zeitgeist">Build the plugin to inject events to <pkg>gnome-extra/zeitgeist</pkg></flag>
  </use>
</pkgmetadata>