gentoo-overlay/dev-python/cython/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>python</herd>
  <longdescription lang="en">
    Cython is a language that makes writing C extensions for the Python
    language as easy as Python itself. It's based on Pyrex, but supports
    more cutting edge functionality and optimizations. 
  </longdescription>
  <use>
    <flag name='numpy'>Enable support for <pkg>dev-python/numpy</pkg></flag>
  </use>
</pkgmetadata>