brew unable to unlink old 'README.md' (Permission denied)

rvm install 2.0.0
met problem about brew

引用

brew unable to unlink old 'README.md' (Permission denied)

solve problem by:

sudo chmod 777 /usr/local
cd /usr/local
git remote add git://github.com/mxcl/homebrew.git
git reset --hard
git clean -f -d
git pull origin master
brew update
sudo chmod 775 /usr/local