Before installing Homebrew you need a compiler, for this, first check this post: How to install Xcode 4.3.2 with Command Line Tools – Mac OS X And then simply run this in terminal: /usr/bin/ruby -e “$(/usr/bin/curl -fksSL https://raw.github.com/mxcl/homebrew/master/Library/Contributions/install_homebrew.rb)”
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