Requirements to compile many of these:
  * A locally compiled version of iglu.lib (or libiglu.a)
  * An OpenGL driver that supports OpenGL 4.2 or later
  * An installed version of GLUT or FreeGLUT
  * An installed version of GLEW that supports OpenGL 4.2 (this means you 
    need GLEW 1.7.0 or later)
  
For a few examples (like the video loader), you also need FFmpeg and its 
associated libraries installed (e.g., libavformat.a).  These have been tested
with FFmpeg 0.9.1.  FFmpeg has been known to change their API and depreciate 
older APIs, so if you are using a newer version and get "unknown function X"
that may be why.

The Makefiles and Visual Studio projects currently require you to adjust
the install locations manually for FFmpeg and IGLU.   Hopefully this will
be improved over time.
