This directory contains google.protobuf module version 2.6.0 build 0. sergiyb@: It has been manually renamed to protobuf26. This is needed to avoid conflicts with a built-in google.protobuf module found on many developer machines. The long-term solution to this problem, however, should be virtualenv. Unfortunately due to limited time and lack of experience, it was not a reasonable short-term solution. If you need to update this package, please make sure that you replace all the references to google.protobuf in the package itself with protobuf26, e.g. from google.protobuf import text_format import google.protobuf becomes from protobuf26 import text_format import protobuf26 Bug tracking setting up virtualenv for depot_tools is https://crbug.com/496241.