_POSIX2_RE_DUP_MAX
#define DUPMAX _POSIX2_RE_DUP_MAX /* xxx is this right? */
#ifdef _POSIX2_RE_DUP_MAX
{ "_POSIX2_RE_DUP_MAX", _POSIX2_RE_DUP_MAX, 255 },
{ "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX },