gentoo-overlay/app-misc/blink1/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <!-- maintainer-needed -->
  <upstream>
    <remote-id type="github">todbot/blink1</remote-id>
  </upstream>
  <use>
    <flag name="tool">Build and install command-line tool blink1-tool</flag>
    <flag name="mini-tool">Build and install command-line mini-tool blink1-mini-tool (normally used for embedded devices)</flag>
    <flag name="server">Build and install REST API server (currently hard-coded to TCP port 8080)</flag>
  </use>
</pkgmetadata>