blas_sys::zgemv_

pub unsafe extern fn zgemv_(trans: *const c_char, m: *const c_int, n: *const c_int, alpha: *const complex_double, a: *const complex_double, lda: *const c_int, x: *const complex_double, incx: *const c_int, beta: *const complex_double, y: *mut complex_double, incy: *const c_int)