Yaakov,

On Monday, December 4, 2017 at 2:47:00 AM UTC-5, feap...@gmail.com wrote:

> [ 77%] Linking CXX executable ../bin/step-8.release
> ../lib/libdeal_II.so.9.0.0-pre: error: undefined reference to 
> 'Epetra_MpiComm::Epetra_MpiComm(int)'
>
There is a problem with Trilinos. deal.II can't link against it. Did you 
move Trilinos or change the configuration? Also if you have installed a new 
version of openmpi, I would strongly recommend that you reinstall all the 
libraries using MPI from scratch. Don't simply run make but delete the 
libraries and reconfigure and reinstall them. Otherwise the libraries may 
use different version of openmpi/mpich and it leads to weird bugs.

Best,

Bruno

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