Install Emacs from homebrew, Mac user only

For brand new install, just run this 4 lines in shell:

brew install --cocoa --srgb emacs
ln -s /usr/local/Cellar/emacs/24.3/Emacs.app /Applications/Emacs.app
ln -s /usr/local/Cellar/emacs/24.3/bin/emacs /usr/local/bin
ln -s /usr/local/Cellar/emacs/24.3/bin/emacsclient /usr/local/bin

Please make sure that "/usr/local/bin" before "/usr/bin" in your $PATH