blas_sys::dgemv_

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