gentoo-overlay/sys-apps/pacman/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <maintainer type="person">
    <email>binki@gentoo.org</email>
    <name>Nathan Phillip Brink</name>
  </maintainer>
  <use>
    <flag name="gpg">Support verifying packages signed with GPG using <pkg>app-crypt/gpgme</pkg></flag>
  </use>
</pkgmetadata>