dev-java/rxtx/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>java</herd>
  <use>
    <flag name="lfd">Installs and uses LockFileServer daemon (lfd)</flag>
  </use>
</pkgmetadata>