# File lib/bundler.rb, line 193
    def with_clean_env
      with_original_env do
        ENV.delete_if { |k,_| k[0,7] == 'BUNDLE_' }
        if ENV.has_key? 'RUBYOPT'
          ENV['RUBYOPT'] = ENV['RUBYOPT'].sub '-rbundler/setup', ''
          ENV['RUBYOPT'] = ENV['RUBYOPT'].sub "-I#{File.expand_path('..', __FILE__)}", ''
        end
        yield
      end
    end