Comment (by Roland Haas):

int driver.cxx nothing is actually used that relies on omp.h (not omp_FOO() function is being called). In boundaries.cxx the calls to omp_FOO() happen only in commented out timer code. I will remove / comment out the #include <omp.h> line.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2946/carpetx-includes-when-openmp-is-not