Comment (by Roland Haas):

David Radice has a Boost thorn: https://github.com/dradice/Boost which we use for CarpetX. It is very slow to compile (compiles serially right now, and in CST which is not thorn-parallel either).

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