title: #include <netdb.h> in clion (with C) and working with threads
body: <p>I'm trying to include: #include &lt;netdb.h&gt; in clion with c.
  This not recognize the include, what I should to do?
  I am new in clion, I used to work with visual studio.</p>
  <p>Moreover, how I should work with threads in clion?
  There is something I should do?</p>