gentoo-overlay/sci-chemistry/pdb2pqr/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>sci-chemistry</herd>
  <use>
    <flag name="opal">Add web interface via opal</flag>
    <flag name="pdb2pka">Install experimental pdb2pka interface</flag>
  </use>
</pkgmetadata>