$ brew uninstall icu4c $ brew versions icu4c 4.8.1.1 git checkout 3f0fb81 /usr/local/Library/Formula/icu4c.rb 50.1 git checkout 03ed757 /usr/local/Library/Formula/icu4c.rb 49.1.2 git checkout c25fd2f /usr/local/Library/Formula/icu4c.rb 4.8.1 git checkout 4ed0519 /usr/local/Library/Formula/icu4c.rb 4.4.1 git checkout c1e5cc2 /usr/local/Library/Formula/icu4c.rb $ cd `brew --prefix` $ git checkout c2