Comment (by Erik Schnetter):

I confirm that the solution is to handle the option string in io_openpmd.cxx in the same way as the Blosc options in io_adios2.cxx, i.e. to use an #ifdef.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2830/carpetx-depends-on-blosc-support-in-adios2