Please note that these warnings are just used to help the Homebrew maintainers with debugging if you file an issue. If everything you use Homebrew for is working fine: please don't worry or file an issue; just ignore this. Thanks! Warning: You have uncommitted modifications to Homebrew/homebrew-core. If this is a surprise to you, then you should stash these modifications. Stashing returns Homebrew to a pristine state but can be undone should you later need to do so for some reason. cd /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core && git stash && git clean -d -f Uncommitted files: ?? 0001-llvm-skip-OpenMP-on-Apple-Silicon.patch