build (Gem::Ext::ConfigureBuilder)

    # File lib/rubygems/ext/configure_builder.rb, line 11
      def self.build(extension, directory, dest_path, results)
        unless File.exist?('Makefile') then
          cmd = "sh ./configure --prefix=#{dest_path}"
          cmd << " #{Gem::Command.build_args.join ' '}" unless Gem::Command.build_args.empty?

          run cmd, results
        end

        make dest_path, results

        results
      end