Github user omalley commented on the issue:
https://github.com/apache/orc/pull/170
A couple of things:
* I'd prefer if the user had to explicitly set the environment to get a
non-default version. That is particularly true for protobuf, which is well
known to not be API compatible between versions.
* I don't think it is necessary to have travis-ci do the build with the
environment variables set.---
