Big Sur clang “invalid version” error due to MACOSX_DEPLOYMENT_TARGET

Question

I assume due to the fact Big Sur is sparkling new hotfixes for the new OS have not yet happen. When attempting to install modules that use clang for compilation

Answer 1

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