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 was to use virtualenv and it was implemented, but had to be reverted due to incompatibilities with ChromiumOS builds (see http://crbug.com/542922). 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 Original bug tracking setting up virtualenv for depot_tools was http://crbug.com/503067, but it was closed as WontFix. If you believe that virtualenv should be added to the current version of depot_tools, please re-open that bug.