title: How to include header file in .c from other directories
body: <p>I'm working in this directory structure</p>
  
  <pre><code>root: Code
  |--src
      |--client
          |--client.c
      |--server
          |--server.c
      |--lib
          |--utility.c
  |--include
      |--prototype.h
      |--utility_lib.h
  </code></pre>
  
  <p>in <code>client.c</code> file, I have to include the <code>utility_lib.h</code> file.</p>
  
  <p>With <code>#include "-I../../include/utility_lib.h"</code>
  it doesn't work, probably the route is not correct.</p>
  
  <p>Anyone could help me?</p>