title: xcode 5 deprecation warning about glut functions
body: <p>I just upgrade my mac os x 10.6.8 to 10.9 this morning. Everything goes fine except the Xcode 5 with OpenGL Glut APIs. Whenever I run my program involving glut functions, I got 30 deprecation warns, like:</p>
  
  <pre><code>'gluErrorString' is deprecated: first deprecated in OS X 10.9.
  'glutBitmapCharacter' is deprecated: first deprecated in OS X 10.9.
  'glutSwapBuffers' is deprecated: first deprecated in OS X 10.9.
  'glutDisplayFunc' is deprecated: first deprecated in OS X 10.9.
  'glutIdelFunc' is deprecated: first deprecated in OS X 10.9.
  ...
  </code></pre>