glibc/sysdeps/mach/hurd/err_hurd.sub

/* This file defines the Mach error system for Hurd server errors.  */

#include <errno.h>

extern const char *const _hurd_errlist[];

/* Omit `const' because we are included with `static'
   defined to `static const'.  */
static struct error_subsystem err_hurd_sub[] =
  {
    { "(os/hurd)", _HURD_ERRNOS, (const char *const *) _hurd_errlist },
  };