__STDC_VERSION__  790 include/config.h #if !defined _Noreturn && __STDC_VERSION__ < 201112
__STDC_VERSION__  820 include/config.h #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__