Comment (by Erik Schnetter):

In CarpetX, we are using some algorithms for non-linear root-finding in con2prim. However, they don’t work on GPUs, and we might want to re-implement them anyway for this reason.

I think that RePrimAnd also uses Boost, probably for filesystem operations (?).

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/1775/add-boost-to-et