const
  _POSIX2_BC_BASE_MAX = 99;
  _POSIX2_BC_DIM_MAX = 2048;
  _POSIX2_BC_SCALE_MAX = 99;
  _POSIX2_BC_STRING_MAX = 1000;
  _POSIX2_COLL_WEIGHTS_MAX = 2;
  _POSIX2_EXPR_NEST_MAX = 32;
  _POSIX2_LINE_MAX = 2048;
  _POSIX2_RE_DUP_MAX = 255;
  _POSIX2_CHARCLASS_NAME_MAX = 14;

  BC_BASE_MAX = _POSIX2_BC_BASE_MAX;
  BC_DIM_MAX = _POSIX2_BC_DIM_MAX;
  BC_SCALE_MAX = _POSIX2_BC_SCALE_MAX;
  BC_STRING_MAX = _POSIX2_BC_STRING_MAX;

  COLL_WEIGHTS_MAX = 255;
  EXPR_NEST_MAX = _POSIX2_EXPR_NEST_MAX;
  LINE_MAX = _POSIX2_LINE_MAX;
  CHARCLASS_NAME_MAX = 2048;
  RE_DUP_MAX = $7fff;