Erst den alten Stand entfernen
$ cd `brew --prefix` $ rm -rf Cellar $ brew prune $ rm -rf Library .git .gitignore bin/brew README.md share/man/man1/brew $ rm -rf ~/Library/Caches/Homebrew
Dann Homebrew installieren
$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"