[SOLVED] MPI compiling problem

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http://www.linuxquestions.org – I was trying to run MPI fortran90 program on my laptop. I installed mpich2 and openmpi. But when I was compling my program via mpif90, it says: Error: There is no specific subroutine for the generic 'mpi_sizeof' I do have 'call mpi_sizeof(ctest8,isize,ierror)' in module mpi.f90. But I thought mpich2 and openmpi should have subroutine 'mpi_sizeof'. How to fix the problem? Thank you! (HowTos)