title: dlib Displaying values on the screen
body: <p>I encountered a strange error- whenever I'm including <code>#include &lt;dlib/gui_widgets.h&gt;</code>
  to my projects and declaring a variable (for example <code>dlib::image_window win</code>) following errors appear: </p>
  
  <p><code>'DLIB_NO_GUI_SUPPORT is defined so you can't use the GUI code.  Turn DLIB_NO_GUI_SUPPORT off if you want to use it.'</code> and <code>'Also make sure you have libx11-dev installed on your system'</code> (from guy_core_kernel_2.h). I was searching and found some suggestions that the cmake of dlib could fail- but I really doubt so, I'm already doing a detection of landmarks. </p>
  
  <p>The reason why I'm trying to include and declare one of the widgets is displaying values on the screen (there is no equivalent of opencv <code>putText()</code>, is there?.</p>
  
  <p>I would be very grateful for any help. :)</p>