_SC_XOPEN_REALTIME  593 ext/etc/constdefs.h #if !defined(_SC_XOPEN_REALTIME)
_SC_XOPEN_REALTIME  595 ext/etc/constdefs.h #  define _SC_XOPEN_REALTIME _SC_XOPEN_REALTIME
_SC_XOPEN_REALTIME 1295 ext/etc/constdefs.h #if defined(_SC_XOPEN_REALTIME)
_SC_XOPEN_REALTIME 1296 ext/etc/constdefs.h     rb_define_const(mod, "SC_XOPEN_REALTIME", INTEGER2NUM(_SC_XOPEN_REALTIME));