Comment (by Erik Schnetter):

Found it. It’s the Silo library https://en.wikipedia.org/wiki/Silo_(library) which I use in CarpetX for 3D output. There hasn’t been a new Silo release in a rather long time, and it doesn’t work with HDF5 >1.10.

That’s probably not relevant for most ET users. It’s still easily possible to install a different HDF5 version manually. I have no objections to updating HDF5 in the ET.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2430/update-tarball-included-in