__APPLE__         973 gc/include/gc.h #  if defined(__APPLE__) && defined(__MACH__) || defined(GC_WIN32_THREADS)
__APPLE__          86 gc/include/gc_config_macros.h # if defined(__APPLE__) && defined(__MACH__) && defined(__ppc__)
__APPLE__         296 gc/include/private/gcconfig.h # if defined(macosx) || (defined(__APPLE__) && defined(__MACH__))