On Wed, 7 Mar 2018, Smith, Barry F. wrote:

>    You have multiple 
>     use xxxx
>     make sure they don't have multiple paths back to MPI. For example if two 
> of them have use petscsys etc
>    Barry


Having 'use petscsys' from multiple modules won't cause problems.

If mpi.h gets included - in multiple modules [directly via mpi.h - or 
indirectly - via petsc includes petsc.h ] - it causes problems.


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