fatal error mpi h No such file or directory include mpi h

Question

when I compile my script with only   include  lt mpi h gt    it tells me that there is no such file or directory  But when i include the path to mpi h as   include   usr include mpi mpi h     the path is correct  it returns   In file included from  usr include mpi mpi h 2087 0                   from lbm cc 7   usr include mpi openmpi ompi mpi cxx mpicxx h 35 17  fatal error  mpi h  No such file or directory   include  mpi h                     compilation terminated    Anyone know how to fix this

User · Answer

You can execute     mpicc -showme    result    gcc -I Users  lt USER NAME gt  openmpi-2 0 1 include -L Users  lt USER NAME gt  openmpi-2 0 1 lib -lmp   This command shows you the necessary libraries to compile mpicc  Example     mpicc -g  -I Users  lt USER NAME gt  openmpi-2 0 1 include -o  nameExec   objetcs o      program c  -lm     mpicc -g  -I Users  lt USER NAME gt  openmpi-2 0 1 include -o example file object o my program c otherlib o -lm   this command generates executable with your program in example  you can execute        example

User · Answer

Debian appears to include the following     mpiCC openmpi mpic   openmpi mpicc openmpi mpicxx openmpi mpif77 openmpi mpif90 openmpi   I ll test symlinks of each for mpic  etc   and see if that helps the likes of HDF5-openmpi enabled find mpi h   Take that back Debian includes symlinks via their alternatives system and it still cannot find the proper paths between HDF5 openmpi packages and mpi h referenced in the H5public h header

User · Answer

On my system Ubuntu 16 04  I installed    sudo apt install libopenmpi-dev   after I used mpiCC to compile and it works

User · Answer

On Fedora   dnf install openmpi-devel

User · Answer

On my system  I was just missing the Linux package    sudo apt install libopenmpi-dev pip install mpi4py    example of something that uses it that is a good instant test to see if it succeeded   Succeded

User · Answer

As suggested above the inclusion of    usr lib openmpi include    in the include path takes care of this  in my case

User · Answer

The problem is almost certainly that you re not using the MPI compiler wrappers  Whenever you re compiling an MPI program  you should use the MPI wrappers    C - mpicc C   - mpiCC  mpicxx  mpic   FORTRAN - mpifort  mpif77  mpif90   These wrappers do all of the dirty work for you of making sure that all of the appropriate compiler flags  libraries  include directories  library directories  etc  are included when you compile your program

[c++] fatal error: mpi.h: No such file or directory #include <mpi.h>

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