[Mac OSX] homebrew update error

failed log:

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$sudo brew update
error: Your local changes to the following files would be overwritten by merge:
    Library/Aliases/gperftools
    Library/Aliases/hashdeep
    Library/Aliases/htop
    Library/Aliases/nodejs
    Library/Aliases/ocio
    Library/Aliases/oiio
		....
error: The following untracked working tree files would be overwritten by merge:
	Library/Aliases/gperftools
    Library/Aliases/hashdeep
    Library/Aliases/htop
    Library/Aliases/nodejs
    Library/Aliases/ocio
    Library/Aliases/oiio
		....
Aborting
Error: Failure while executing: git pull -q origin refs/heads/master:refs/remotes/origin/master

Solution:

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$ cd /usr/local
$ git fetch origin
$ git reset --hard origin/master

reference
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