extern int v3p_netlib_zdrot_(
  v3p_netlib_integer *n,
  v3p_netlib_doublecomplex *zx,
  v3p_netlib_integer *incx,
  v3p_netlib_doublecomplex *zy,
  v3p_netlib_integer *incy,
  v3p_netlib_doublereal *c__,
  v3p_netlib_doublereal *s
  );