old_contents: from google.appengine.ext import vendor
  
  # Add any libraries installed in the "lib" folder.
  vendor.add('lib')
new_contents: from google.appengine.ext import vendor
  import os
  
  # Add any libraries installed in the "lib" folder.
  vendor.add(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'lib'))
subject: fix vendor lib