我在 Mac OS X 下执行 brew update 出错

➜   brew update
error: Your local changes to the following files would be overwritten by merge:
    Library/Formula/abcde.rb
    Library/Formula/acpica.rb
    ............
    Library/Formula/pypy.rb
    Library/For
error: The following untracked working tree files would be overwritten by merge:
    Library/Aliases/actor-framework
    Library/Formula/aescrypt-packetizer.rb
    ............
    Library/Formula/stlink.rb
    Library/Formula/with-readline.rb
Please move or remove them before you can merge.
Aborting
Error: Failure while executing: git pull -q origin refs/heads/master:refs/remotes/origin/master Read More