_CS_GNU_LIBC_VERSION  808 ext/etc/constdefs.h #if !defined(_CS_GNU_LIBC_VERSION)
_CS_GNU_LIBC_VERSION  810 ext/etc/constdefs.h #  define _CS_GNU_LIBC_VERSION _CS_GNU_LIBC_VERSION
_CS_GNU_LIBC_VERSION 1424 ext/etc/constdefs.h #if defined(_CS_GNU_LIBC_VERSION)
_CS_GNU_LIBC_VERSION 1425 ext/etc/constdefs.h     rb_define_const(mod, "CS_GNU_LIBC_VERSION", INTEGER2NUM(_CS_GNU_LIBC_VERSION));