Comment (by Wolfgang Kastaun):

What would be the cactus way of requiring a minimum GSL version from the externallibraries GSL thorn?

Note: The GSL dependence will probably be removed in the foreseeable future in favor of BOOST.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2610/reprimand-thorn-requires-gsl-20-but-does