使用brew安装telnet时，报错Error: Your Xcode does not support macOS 11.2. It is either outdated or was modified. Please update your Xcode or delete it if no updates are available.

brew install telnet
Updating Homebrew...
Warning: You are using macOS 11.2.
We do not provide support for this pre-release version.
You will encounter build failures with some formulae.
Please create pull requests instead of asking for help on Homebrew's GitHub,
Twitter or any other official channels. You are responsible for resolving
any issues you experience while you are running this
pre-release version.

==> Downloading https://opensource.apple.com/tarballs/libtelnet/libtelnet-13.tar
Already downloaded: /Users/zxs.zl/Library/Caches/Homebrew/downloads/4fe26613ac3f91bd2fa2ed4e9ca39a043c6fd5960c4e0a3f063c672911900665--libtelnet-13.tar.gz
==> Downloading https://opensource.apple.com/tarballs/remote_cmds/remote_cmds-63
Already downloaded: /Users/zxs.zl/Library/Caches/Homebrew/downloads/557d5b69c452e48e5337f6d80e827514cd2218e1c02dcd42f893bd2cafe7d141--remote_cmds-63.tar.gz
Error: Your Xcode does not support macOS 11.2.
It is either outdated or was modified.
Please update your Xcode or delete it if no updates are available.

将Xcode.app先移动到其他位置，然后在运行brew install telnet，最后把Xcode.app移动回来

sudo mv ./Applications/Xcode.app ~/Desktop
brew install telnet
sudo mv ~/Desktop/Xcode.app  ./Applications