If you happen to get any of the following errors while installing something on MAC OS
touch: /usr/local/Homebrew/.git/FETCH_HEAD: Permission denied touch: /usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask/.git/FETCH_HEAD: Permission denied touch: /usr/local/Homebrew/Library/Taps/dart-lang/homebrew-dart/.git/FETCH_HEAD: Permission denied touch: /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/.git/FETCH_HEAD: Permission denied fatal: Unable to create '/usr/local/Homebrew/.git/index.lock': Permission denied error: could not lock config file .git/config: Permission denied Warning: carthage 0.26.2 is already installed, it's just not linked. You can use `brew link carthage` to link this version.
In macOS Catalina 10.15.1
sudo chown -R $(whoami):admin /usr/local/* && sudo chmod -R g+rwx /usr/local/*