Improvements to the libmongocrypt Evergreen build (
CDRIVER-3124) resulted in build failures ( CDRIVER-3138) that have revealed that calc_release_version.py fails on Python 2.6:
Since RHEL 6 (which has Python 2.6) is a supported/recommended platform for the server product, the C++ Driver build should also work with Python 2.6. This ticket is a clone of
CDRIVER-3157 since calc_release_version.py is duplicated between the C and C++ Drivers.