title: X11/Xlib.h not found in Ubuntu
body: <p>I'm trying to write a rather trivial program using open gl on linux, but at a compile time it says:</p>
  
  <blockquote>
    <p>Compile thumb  : egl &lt;= cuberenderer.c
    In file included from
    /path/include/egl.h:36,
                     from /path/cuberenderer.c:7:
    /path/include/eglplatform.h:89:22:
    error: X11/Xlib.h: No such file or
    directory
    /path/include/eglplatform.h:90:23:
    error: X11/Xutil.h: No such file or
    directory</p>
  </blockquote>
  
  <p>I'm totally new to GL and have no idea what's wrong.</p>