On Tuesday, February 13, 2018 at 8:55:34 PM UTC-5, Daipayan Sarkar wrote:
> At ~ 48% I get the following error message: 
> *error: **"PETSc was configured with MPICH but now appears to be 
> compiling using a non-MPICH mpi.h"*
The problem is that you are mixing two different versions of MPI and you 
are not allowed to do that. You have told petsc to install mpich 
(--download-mpich) but you probably already have another mpi on your 
system. I would advise you to reinstall petsc without the option 



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