title: filesystem location and compile with md5 under linux?
body: <p>I am running stock linux gnome ubuntu 13.10.  A locate from the cli tells me the md5.h file is at</p>
  
  <pre><code>/usr/src/linux-headers-3.8.0-32-generic/include/config/crypto/md5.h
  </code></pre>
  
  <p>but most examples here tell me to include an openssl .h file.  simply put, what header file should I include in the C file to have my program compile under most linux installations (and how do I invoke gcc to find it; does it need a library link)?</p>
  
  <p>thanks.</p>