For those of us who live in Emacs, it's always a bad feeling when Emacs won't start, which happened to me today after upgrading my office Mac. I ran doom doctor which ran through a few checks and stopped with
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There was an unexpected runtime error
Message: Native compiler error
Details: ((lambda (arg106 &optional arg107 arg108) (let (...) (funcall f arg106 arg107 arg108))) "Compiling /Users/rlridenour/.emacs.d/.local/cache/eln/28.2-75f7b60d/subr--trampoline-72657175697265_require_0.eln...\nxcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun\nlibgccjit.so
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followed by a bunch of incomprehensible (to me) nonsense. The important part being
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invalid active developer path (/Library/Developer/CommandLineTools)
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I always forget that upgrading the OS usually necessitates upgrading the Command Line Developer Tools, so
fixed everything.