There is problem report about failing builds against ROOT v5. https://bitbucket.org/tmidas/rootana/issues/19/make-error-rtypesimph-should-only-be
At TRIUMF, do we even still have anybody who uses ROOT v5 with ROOTANA?
My newest copy of ROOT v5 is from 2016 and I am not sure it would run on any computer we still have.
So is ROOT v5 still relevant, should we officially say ROOT v5 is not supported?