Warning: You are using macOS 11.0. We do not provide support for this released but not yet supported version. You will encounter build failures with some formulae. Please create pull requests instead of asking for help on Homebrew's GitHub, Discourse, Twitter or any other official channels. You are responsible for resolving any issues you experience while you are running this released but not yet supported version. 这是 warning 不是错误，可以正常安装 看看 homebrew 官网，说是会随着 Big Sur 的上线而上线支持的版本，但是并没有，相关的 pr 也有了，估计很快适配了。