gentoo-overlay/app-backup/deja-dup/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>gnome</herd>
  <maintainer>
    <email>jlec@gentoo.org</email>
  </maintainer>
  <use>
    <flag name="nautilus">Build gnome-base/nautilus extension</flag>
  </use>
  <upstream>
    <remote-id type="launchpad">deja-dup</remote-id>
  </upstream>
</pkgmetadata>