Hello,
I want to run Step-42 but I receive below error:

 Error! The deal.II library found at / was not configured with

      DEAL_II_WITH_MPI = ON
      DEAL_II_WITH_P4EST = ON
      DEAL_II_WITH_TRILINOS = ON

 One or all of these are OFF in your installation but are required for this 
tutorial step.

But I already have installed Trilinos and P4EST and reinstalled deal ii 
with:

cmake -DDEAL_II_WITH_64BIT_INDICES= ON  
          -DDEAL_II_WITH_MPI= ON
          -DEAL_II_WITH_P4EST= ON
          -DEAL_II_WITH_TRILINOS= ON
          -DP4EST_DIR=/home/General_for_All_Users/P4EST_install_dir/
          
-DTRILINOS_DIR=/home/General_for_All_Users/Trilinos_install_dir/trilinos_path   
   

          -DCMAKE_INSTALL_PREFIX= 
/home/General_for_All_Users/deal_II_install_dir 
          ../
My system has one CPU with 4 threads and mu OS is Ubuntu.

Can you please guide me to solve this problem.

Thanks.
Ehsan

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