Comment (by Miguel Zilhão):

I see. On Marenostrum, I can indeed fix this by pointing to a suitable g++ version. On our local cluster, however, they only provide updated intel compiles and the gcc available is version 4. Is there anyway around this, or do I really need to ask the sysadmins to provide updated gcc compilers as well?

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2705/error-more-than-one-instance-of-overloaded