gentoo-overlay/app-office/rabbit/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<maintainer><email>maintainer-needed@gentoo.org</email></maintainer>
<herd>ruby</herd>
<use>
  <flag name='tgif'>tgif support (<pkg>media-gfx/tgif</pkg>)</flag>
  <flag name='markdown'>Markdown support (<pkg>dev-ruby/kramdown</pkg>)</flag>
</use>
</pkgmetadata>