write_build_info_file

# File lib/rubygems/installer.rb, line 768
  def write_build_info_file
    return if @build_args.empty?

    build_info_dir = File.join gem_home, 'build_info'

    FileUtils.mkdir_p build_info_dir

    build_info_file = File.join build_info_dir, "#{spec.full_name}.info"

    open build_info_file, 'w' do |io|
      @build_args.each do |arg|
        io.puts arg
      end
    end
  end