# 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}" # ENV is frozen

    run cmd, results

    results
  end