Big Sur clang “invalid version” error due to MACOSX_DEPLOYMENT_TARGET

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I would like to extend @Felipe excellent answer; if it doesn’t work even with running

>>> softwareupdate --all --install --force
Software Update Tool

Finding available software
No updates are available.

…following the wisdom of the “homebrew doctor” solves it, i.e. remove and reinstall:

sudo rm -rf /Library/Developer/CommandLineTools
sudo xcode-select --install

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