Hi Arham, I think you have multiple MPI installations mixing up. Please double check that you are using the correct `mpicc` and check the results with `ldd`. -- Hui Zhou From: Arham Amouei via discuss <[email protected]> Reply-To: Arham Amouei <[email protected]>, "[email protected]" <[email protected]> Date: Wednesday, July 8, 2020 at 10:48 AM To: "[email protected]" <[email protected]> Cc: Arham Amouei <[email protected]> Subject: [mpich-discuss] Receiving fortran-related errors when compiling MPICH 3.3.2 Hello. Despite I have disabled fortran by --disable-fortran, I receive errors related to fortran when compiling MPICH 3.3.2. Example: .../linux/mpi/intel64/lib/libmpifort.so.12: undefined reference to `PMPI_Type_create_f90_complex' How can I get rid of those errors without changing other installed softwares? Please find attached m.txt and c.txt files. Kind regards, Arham