Giselle,

You have multiple versions of MPI installed on your computer. I would 
strongly advise that you remove the extra MPI libraries and keep only one 
of them. Anyway to fix your issue, you can use 
`-DMPI_CXX_COMPILER=/path/to/mpich/mpicxx` to tell CMake which MPI compiler 
to use.

Best,

Bruno

On Friday, September 1, 2023 at 2:13:45 PM UTC-4 gisel...@gmail.com wrote:

Hello,

I have a PETSc installation that uses mpich. I am trying to install deal II 
with:

cmake -DDEAL_II_WITH_PETSC=ON 
-DCMAKE_INSTALL_PREFIX=/Users/gisellesosajones/Documents/deal_ii_95 
-DPETSC_DIR=$PETSC_DIR -DPETSC_ARCH=$PETSC_ARCH -DDEAL_II_WITH_MPICH=ON 
-DDEAL_II_WITH_HDF5=OFF


However, I get the error message

*PETSc was configured with MPICH but now appears to be compiling using a 
non-MPICH mpi.h*


when trying to install. Is there any workaround for this?

Thank you in advance.

Giselle

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