require 'formula' class RubyBuild < Formula homepage 'https://github.com/sstephenson/ruby-build' url 'https://github.com/sstephenson/ruby-build/tarball/v20121020' sha1 '62d2ed8995c02e5d8e3f55f0db381b4e3d44d310' head 'https://github.com/sstephenson/ruby-build.git' def install ENV['PREFIX'] = prefix system "./install.sh" end end