gentoo-overlay/app-laptop/tp_smapi/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <!-- maintainer-needed -->
  <use>
    <flag name="hdaps">Install a compatible HDAPS module</flag>
  </use>
  <upstream>
    <remote-id type="github">evgeni/tp_smapi</remote-id>
    <remote-id type="sourceforge">tpctl</remote-id>
  </upstream>
</pkgmetadata>