app-office/mozilla-sunbird/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<herd>mozilla</herd>
<use>
  <flag name='moznopango'>Disable pango during runtime</flag>
</use>
</pkgmetadata>