Cannot find a C preprocessor when configure the PETSc

[1Northward1]

Hi,

I am installing the DAFoam on Ubuntu 20.04 and exactly followed the command in the installation tutorial.
There was a problem configuring PETSc:

===============================================================================
Configuring PETSc to compile on your system

TESTING: checkCPreprocessor from config.setCompilers(config/BuildSystem/config/setCompilers.py:699) *******************************************************************************
UNABLE to CONFIGURE with GIVEN OPTIONS (see configure.log for details):

Cannot find a C preprocessor

---

With the help of my friends, I activated the conda environment on the new terminal and then compiled it again. This problem can be solved, but an error occurred when compiling the DAFoam:

/bin/sh: /home/Mars/dafoam/packages/miniconda3/lib/libtinfo.so.6: no version information available (required by /bin/sh)
In file included from /home/Mars/dafoam/packages/petsc-3.14.6/include/petscis.h:7,
from /home/Mars/dafoam/packages/petsc-3.14.6/include/petscvec.h:9,
from /home/Mars/dafoam/packages/petsc-3.14.6/include/petscmat.h:6,
from /home/Mars/dafoam/packages/petsc-3.14.6/include/petscpc.h:6,
from /home/Mars/dafoam/packages/petsc-3.14.6/include/petscksp.h:6,
from DAUtility/DAUtility.H:16,
from DAUtility/DAUtility.C:8:
/home/Mars/dafoam/packages/petsc-3.14.6/include/petscsys.h:219:6: error: #error "PETSc was configured with one OpenMPI mpi.h version but now appears to be compiling using a different OpenMPI mpi.h version"
219 | # error "PETSc was configured with one OpenMPI mpi.h version but now appears to be compiling using a different OpenMPI mpi.h version"
| ^~~~~

What can be the possible cause?
I would appreciate it if you help me.

Best regards,
Mars

[friedenhe]

PETSc was configured with one OpenMPI mpi.h version but now appears to be compiling using a different OpenMPI mpi.h version The error says that you use two different MPI versions to compile Petsc and DAFoam. Double check if you have followed the exact steps to compile DAFoam.