remove homebrew complete in mac

~$ sudo rm -rf /usr/local
~$ sudo mkdir /usr/local

~$ sudo chown -R 777 /usr/local
install homebrew

~$ sudo chown -R $USER /Library/Caches/Homebrew

~$ brew install automake libtool pkg-config gcc48 libyaml readline libksba openssl

install rvm
rvm requirements