    # File lib/rubygems/ext/rake_builder.rb, line 11
      def self.build(extension, directory, dest_path, results)
        if File.basename(extension) =~ /mkrf_conf/i then
          cmd = "#{Gem.ruby} #{File.basename extension}"
          cmd << " #{ARGV.join " "}" unless ARGV.empty?
          run cmd, results
        end

        cmd = ENV['rake'] || 'rake'
        cmd << " RUBYARCHDIR=#{dest_path} RUBYLIBDIR=#{dest_path}"

        run cmd, results

        results
      end