There's an issue with the scanner on Mac OS X because you can have an
include like "#include <OpenGL/OpenGL.h>", but instead of the header
file being "/usr/include/OpenGL/OpenGL.h", it's actually "/System/
Library/Frameworks/OpenGL.framework/Headers/OpenGL.h". Even though "/
System/Library/Frameworks" gets picked up in scanner discovery, it is
not the path of the actual header directory, so the headers get missed
by the indexer.