Comment (by Roland Haas):

I see. An ET provided Boost ExternalLibrary would have to include all of Boost, both the STL template parts and the compiled parts, since we would not know what each thorn uses.

If the dependency persists the is should be listed in configuration.ccl along with GSL etc.

You may also need to consider an OPTIONAL dependency on CMake in particular if you require a non-ancient cmake. Some of CarpetX dependencies do that (AMReX, ADIOS I think) and can optionally use a cmake in ${CMAKE_DIR}/bin/cmake instead of just cmake. I think the two of them between them now require cmake 3.23 (from around July 2022, so very very recent for HPC clusters).

--
Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2692/inclusion-of-fuka-importer-thorns