_WIN32            983 gc/include/gc.h         || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__))
_WIN32            105 gc/include/gc_config_macros.h     (defined(_WIN32) || defined(_MSC_VER) || defined(__CYGWIN__) \
_WIN32            372 gc/include/private/gcconfig.h         || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__)