code: def after_install(options, home_dir):
      # --- CUT here ---
      
      if options.install_type==INST_PYPI:
          requirements=NORMAL_INSTALLATION
      elif options.install_type==INST_GIT:
          requirements=GIT_READONLY_INSTALLATION
      elif options.install_type==INST_DEV:
          requirements=DEVELOPER_INSTALLATION
      else:
          # Should never happen
          raise RuntimeError("Install type %r unknown?!?" % options.install_type)
  
      env_subprocess = EnvSubprocess(home_dir) # from bootstrap_env.bootstrap_install_pip
  
      logfile = os.path.join(env_subprocess.abs_home_dir, "install.log")
  
      for requirement in requirements:
          sys.stdout.write("\n\nInstall %r:\n" % requirement)
          env_subprocess.call_env_pip(["install", "--log=%s" % logfile, requirement])
          sys.stdout.write("\n")
docs: called after virtualenv was created and pip/setuptools installed.
      Now we installed requirement libs/packages.