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-- Checking for one of the modules 'ompi-cxx' CMake Warning at CMakeLists.txt:745 (message): mpi.h was not found. Check for error above.
I'm not clear what this means. Can the CMake output re-assure that in 'the end it doesn't matter' ?Kunda: there is something strange with the pkg-config for OpenMPI, because OPENMPI_INCLUDE_DIRS is empty on the CMake side. That's the reason for that warning. However, said include dir is just /usr/include, so at the end it doesn't matter.