* freeglut_internal.h uses some GL types, but including the GL header portably
* is a bit tricky, so we include freeglut_std.h here, which contains the
* necessary machinery. But this poses another problem, caused by the ugly
* freeglut_internal.h uses some GL types, but including the GL header portably
* is a bit tricky, so we include freeglut_std.h here, which contains the
* necessary machinery. But this poses another problem, caused by the ugly