Sambit,

the first issue you observed is related to 
https://gitlab.kitware.com/cmake/cmake/issues/17538.
In particular, the MPI include directories might not be set correctly for 
the CUDA compiler.
This often happens when the CMAKE_CXX_COMPILER does not need additional 
include directories to
compiler MPI code, e.g. if the CMAKE_CXX_COMPILER is a MPI wrapper.

The third issue is fixed in https://github.com/dealii/dealii/pull/7213.

Best,
Daniel

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