Comment (by Roland Haas):

Sciama, being the last provably active machine without C++11 options in use was updated in git hash 5c8d8a62 "sciama: require C++11 in option" of simfactory2 to provide C++11.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2207/support-all-of-c-11-in-cactus-or-the