Hello, I found a surprising "mumps_mpi.h" head included in src/ClpCholeskyMumps.cpp ... This header is not in the repo of Clp. I think this one comes from mumps libseb -> mpi.h copied as mumps_mpi.h But what about not using libseb and using mpi instead ? Do I need to copy /usr/include/mpi.h into mumps_mpi.h ? Best regards, YC