You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: po4a.rb
    path of file: ./repos/homebrew-core/Formula/p
    
    the code of the file until where you have to start completion: require "langu
    
  def install
    ENV.prepend_create_path "PERL5LIB", libexec/"lib/perl5"
    ENV.prepend_path "PERL5LIB", libexec/"lib"

    resources.each do |r|
      r.stage do
        if File.exist?("Makefile.PL")
          system "perl", "Makefile.PL", "INSTALL_BASE=#{libexec}", "NO_MYMETA=1"
          system "make", "install"
        else
          system "perl", "Build.PL", "--install_base", libexec
          system "./Build"
          system "./Build", "install"
        end
      end
    end