HomeBrewでError: python@3.9とエラーが出る時の対処法【Mac】

brew install graphviz

Error: python@3.9: the bottle needs the Apple Command Line Tools to be installed.

  You can install them, if desired, with:

    xcode-select --install

You can try to install from source with:

  brew install --build-from-source python@3.9

Please note building from source is unsupported. You will encounter build

failures with some formulae. If you experience any issues please create pull

requests instead of asking for help on Homebrew's GitHub, Twitter or any other

official channels.

xcode-select --install