Github user alpinegizmo commented on the issue:
https://github.com/apache/flink/pull/3013
Max, this latest commit allows one to take advantage of ruby 2.0 if it is
available, but is backwards compatible to 1.9. Hopefully this will satisfy
everyone. The only issue I can see is that if one runs the build_docs script
with ruby 2.x then Gemfile.lock will be updated with newer versions which
probably should not be checked in.
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