pub type dger_ex_ft = Option<unsafe extern "C" fn(conjx: conj_t, conjy: conj_t, m: dim_t, n: dim_t, alpha: *const f64, x: *const f64, incx: inc_t, y: *const f64, incy: inc_t, a: *mut f64, rs_a: inc_t, cs_a: inc_t, cntx: *const cntx_t, rntm: *mut rntm_t)>;
