app-misc/tablix/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<use>
  <flag name="pvm">Add support for parallel virtual machine
    (<pkg>sys-cluster/pvm</pkg>)</flag>
</use>
</pkgmetadata>