_SC_XOPEN_STREAMS  608 ext/etc/constdefs.h #if !defined(_SC_XOPEN_STREAMS)
_SC_XOPEN_STREAMS  610 ext/etc/constdefs.h #  define _SC_XOPEN_STREAMS _SC_XOPEN_STREAMS
_SC_XOPEN_STREAMS 1304 ext/etc/constdefs.h #if defined(_SC_XOPEN_STREAMS)
_SC_XOPEN_STREAMS 1305 ext/etc/constdefs.h     rb_define_const(mod, "SC_XOPEN_STREAMS", INTEGER2NUM(_SC_XOPEN_STREAMS));