title: fprintf, error: format not a string literal and no format arguments [-Werror=format-security
body: <p>when I try to compile <code>fprintf(stderr,Usage)</code> on Ubuntu I got this error:</p>
  
  <pre><code> error: format not a string literal and no format arguments [-Werror=format-security
  </code></pre>
  
  <p>but when I compiled that on other linux distributions (RedHat, Fedora, SUSE) that is compiled successfully.</p>
  
  <p>Anyone has an idea?  </p>