# File lib/bundler/bundle.rb, line 163
    def setup_environment
      unless @environment.system_gems
        ENV["GEM_HOME"] = gem_path
        ENV["GEM_PATH"] = gem_path
      end
      ENV["PATH"]     = "#{bindir}:#{ENV["PATH"]}"
      ENV["RUBYOPT"]  = "-r#{gem_path}/environment #{ENV["RUBYOPT"]}"
    end