久しぶりに brew update してみたら、 -> % brew update error: The following untracked working tree files would be overwritten by merge: Library/Formula/argp-standalone.rb Library/Formula/cmigemo.rb Library/Formula/ninja.rb Library/Formula/pbrt.rb Library/Formula/voldemort.rb Please move or remove them before you can merge. Aborting Error: Failure while executing: git pull -q origin refs/heads/master:refs/remot