Comment (by Erik Schnetter):

I’m working on a Spack recipe for the Einstein Toolkit. It’s working (with many external libraries, of course), but it currently uses plain make instead of Simfactory. Once that’s done I’ll submit it as official package.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2553/cactus-link-command-uses-cppflags-and