On 4/2/21 4:29 AM, pushkar...@gmail.com wrote:

/home/pushkar/dealii-9.0.0/source/lac/trilinos_precondition_muelu.cc: fatal error: MueLu_EpetraOperator.hpp: No such file or directory
    34 | #  include <MueLu_EpetraOperator.hpp>

Pushkar -- the questions to ask are (i) does this file exist, (ii) if it does, why is the compiler not finding it, (iii) if it does not exist, why not?

MueLu is a part of the Trilinos software. It is conceivable that it was part of previous Trilinos versions, but is no longer. The current deal.II version no longer #includes this file, which suggests that indeed that file has gone away. So we would have fixed this in newer deal.II versions, and one of the possibilities is that you happen to have an old deal.II but new Trilinos version and that these are just no longer compatible. If that is so, you will have to either upgrade to a newer deal.II version or downgrade Trilinos to an older version.

Best
 W.

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Wolfgang Bangerth          email:                 bange...@colostate.edu
                           www: http://www.math.colostate.edu/~bangerth/

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