title: Mac network ping source code compile error
body: <p>I download the Mac OS network ping source code from Apple: <a href="http://www.opensource.apple.com/tarballs/network_cmds/network_cmds-356.8.tar.gz" rel="nofollow">http://www.opensource.apple.com/tarballs/network_cmds/network_cmds-356.8.tar.gz</a></p>
  
  <p>and compile it in xcode, but get errors in both 10.7 and 10.6, </p>
  
  <blockquote>
    <p>'IP_NO_IFT_CELLULAR' undeclared (first use in this function)<br>
    'SO_TRAFFIC_CLASS' undeclared (first use in this function)<br>
    'SO_RECV_TRAFFIC_CLASS' undeclared (first use in this function)<br>
    'SO_TRAFFIC_CLASS' undeclared (first use in this function)</p>
  </blockquote>
  
  <p>Did I miss something?</p>