pub unsafe extern fn zgtcon_(norm: *const c_char, n: *const lapack_int, dl: *const lapack_complex_double, d: *const lapack_complex_double, du: *const lapack_complex_double, du2: *const lapack_complex_double, ipiv: *const lapack_int, anorm: *const c_double, rcond: *mut c_double, work: *mut lapack_complex_double, info: *mut lapack_int)