Centos 64: ep-engine build error in 3.0.0 branch

There is a build error for 3.0.0 version Centos 64 from ep-engine

Log file is located at:

http://builds.hq.northscale.net:8010/builders/centos-5-x64-300-builder/builds/410/steps/couchbase-server%20make%20enterprise%20/logs/stdio

/home/buildbot/centos-5-x64-300-builder/build/build/cmake/ep-engine/src/histo.h: In instantiation of ‘Histogram<long unsigned int>’:
/home/buildbot/centos-5-x64-300-builder/build/build/cmake/ep-engine/src/histo.h:394: instantiated from here
/home/buildbot/centos-5-x64-300-builder/build/build/cmake/ep-engine/src/histo.h:370: warning: lowering visibility of ‘std::ostream& operator<<(std::ostream&, const Histogram<Ttype>&) [with Ttype = Ttype, T = long unsigned int]’ to match its type
/home/buildbot/centos-5-x64-300-builder/build/build/cmake/ep-engine/src/histo.h: In instantiation of ‘Histogram<unsigned int>’:
/home/buildbot/centos-5-x64-300-builder/build/build/cmake/ep-engine/src/stored-value.h:625: instantiated from here
/home/buildbot/centos-5-x64-300-builder/build/build/cmake/ep-engine/src/histo.h:370: warning: lowering visibility of ‘std::ostream& operator<<(std::ostream&, const Histogram<Ttype>&) [with Ttype = Ttype, T = unsigned int]’ to match its type