title: Where is OpenGLConfig.cmake located on mac?
body: <p>I'm using OpenGL with a C++ project. When I run configure in cmake-gui I get the following error:</p>
  <pre><code>CMake Error at CMakeLists.txt:18 (find_package):
  Could not find a package configuration file provided by &quot;OpenGL&quot; with any
  of the following names:
  
  OpenGLConfig.cmake
  opengl-config.cmake
  
  Add the installation prefix of &quot;OpenGL&quot; to CMAKE_PREFIX_PATH or set
  &quot;OpenGL_DIR&quot; to a directory containing one of the above files.  If &quot;OpenGL&quot;
  provides a separate development package or SDK, be sure it has been
  installed.
  </code></pre>
  <p>Presumably, I have to set the OpenGL_DIR value but I can't find where OpenGLConfig.cmake file is located on mac.</p>