extern int v3p_netlib_zrot_(
  v3p_netlib_integer *n,
  v3p_netlib_doublecomplex *cx,
  v3p_netlib_integer *incx,
  v3p_netlib_doublecomplex *cy,
  v3p_netlib_integer *incy,
  v3p_netlib_doublereal *c__,
  v3p_netlib_doublecomplex *s
  );