title: How to prevent Xcode 4.5 from allowing OpenGL ES2 calls
body: <p>I am only including OpenGL ES1 headers, yet I am able to compile my project successfully with such lines as:</p>
  
  <pre><code>glReleaseShaderCompiler();
  </code></pre>
  
  <p>Is Xcode 4.5 secretly swapping out ES1 headers with ES2 headers behind the scene?  How would I be able to inspect exactly what headers are included in the build process?</p>