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: ns-3.rb
    path of file: ./repos/homebrew-core/Formula/n
    
    the code of the file until where you have to start completion: class Ns3 < Formula
  include Language::Python::Virtualenv

  desc "Discrete-event network simulator"
  homepage "https://www.nsnam.org/"
  url "https://gitlab.com/nsnam/ns-3-dev/-/archive/ns-3.41/ns-3-dev-ns-3.41.tar.gz"
  sha256 "1b11d609e26cfb684404e77f44a3951f4d238220618b0bdbfc766a701c1cc5a8"
  license "GPL-2.0-only"

  bottle do
    sha256                          
    
  def install
    # Fix binding's rpath
    linker_flags = ["-Wl,-rpath,#{loader_path}"]

    system "cmake", "-S", ".", "-B", "build",
                    "-DNS3_GTK3=OFF",
                    "-DNS3_PYTHON_BINDINGS=OFF",
                    "-DNS3_MPI=ON",
                    "-DCMAKE_SHARED_LINKER_FLAGS=#{linker_flags.join(" ")}",
                    *std_cmake_args
    system "cmake", "--build", "build"
    system "cmake", "--install", "build"

    pkgshare.install "examples/tutorial/first.cc"
  end