title: IP_RECVDSTADDR is not defined
body: <p>error: IP_RECVDSTADDR undeclared (first use in this function), can I use this socket option with Linux or it is already is undefined I searched in all in.h files on linux but I could't find anything about it.</p>
  
  <p>Steven is used it but he types </p>
  
  <pre><code>#ifdef IP_RECVDSTADDR 
  .......
  #endif
  </code></pre>