title: Erro when running OpenGL projet under Ubuntu 10.04
body: <p>I downloaded QtSDK from website and installed on my computer, my OS is Ubuntu 10.04.</p>
  
  <p>When I compile a project of OpenGL, there is an error "GL/gl.h no such file or directory".</p>
  
  <p>but when I compile the projet under windows, it works. Why?</p>
  
  <p>Who can resolve this problem for me?</p>