Set CUDA_ARCH_HOST_COMPILER to in the build script

if [[ ${WITH_CLANG} == "yes" ]]; then

   export CXX=clang++

   export CC=clang

else

   export CXX=g++

   export CC=gcc

fi

if [[ ${WITH_MPI} == "yes" ]]; then

#       if [ -n "$CXX" ]; then

#          export OMPI_CXX="$CXX"

#       fi

       export CXX=mpicxx

       export CUDA_ARCH_HOST_COMPILER="$CXX"

       export CUDA_HOST_COMPILER=mpicxx

       export CXX=mpicxx

    fi

    if [[ ! -x  "$(command -v mpicc)" ]]; then

       echo "Warning: mpicc is not installed on this system."