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 type="person">
    <email>mjo@gentoo.org</email>
    <name>Michael Orlitzky</name>
  </maintainer>

  <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>