gentoo-overlay/net-im/coturn/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <!-- maintainer-needed -->
  <upstream>
    <remote-id type="github">coturn/coturn</remote-id>
  </upstream>
  <use>
    <flag name="mongodb">Enable support for the mongodb database</flag>
    <flag name="redis">Enable support for the redis database</flag>
  </use>
</pkgmetadata>