title: warning: implicit declaration of function 'kill'
body: <p>I am making these inclusions:</p>
  
  <pre><code>#include &lt;signal.h&gt;
  #include &lt;unistd.h&gt;
  #include &lt;sys/types.h&gt;
  #include &lt;sys/wait.h&gt;
  </code></pre>
  
  <p>But still getting this warning.</p>