gentoo-overlay/media-video/gnome-mplayer/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="project">
    <email>media-video@gentoo.org</email>
  </maintainer>
  <use>
    <flag name="dconf">Enable support for <pkg>gnome-base/dconf</pkg></flag>
    <flag name="gda">Enable support for <pkg>gnome-extra/libgda</pkg></flag>
  </use>
</pkgmetadata>