Dear all, I’m stuck with this problem since some time and I like to know if someone has a solution, or just a hint of what is going wrong. If I compile MOAB with HDF5 support I’m forced to use an outdated version of the latter (hdf5 1.8.12 works just fine) because a newer version (I tried both 1.8.18 and 1.10.1) produces the following runtime error *** The MPI_Comm_dup() function was called before MPI_INIT was invoked. *** This is disallowed by the MPI standard. *** Your MPI job will now abort. [dlm249-158.unibg.it:1072] Local abort before MPI_INIT completed completed successfully, but am not able to aggregate error messages, and not able to guarantee that all other processes were killed! This happens when the MOAB function load_file(filename.h5m,...) gets called from my application. All the MOAB tests run just fine, in particular the parallel tests involving hdf5 are successful. I guess that’s a linking issue but I really don’t know how to solve it. My makefile is really basic I do MOAB_LIB_DIR = /Users/digihabia/src2/moab-4.9.2/moab/ include $(MOAB_LIB_DIR)/lib/moab.make … I compile my library spafedte with %.o : %.cpp @echo "Compiling ("$(CXX)") "$<" " @$(CXX) $(spafedte_INCLUDE) $(petsc_INCLUDE) ${MOAB_INCLUDES} $(muparser_INCLUDE) $(metis_INCLUDE) $(mgridgen_INCLUDE) $(eigen_INCLUDE) -c $< -o $@ And build the executable with laplace_test : $(objects) @echo "Linking "$(CURDIR)"/"$@ @$(CXX) $(objects) -o $@ $(spafedte_LIB) $(PETSC_SNES_LIB) $(MOAB_LIBS_LINK) $(MGRIDGEN_LIB) $(METIS_LIB) Any help is appreciated. Bests Lorenzo