Fixing compilation with mpi wrappers

CMakeLists.txt

@@ -40,6 +40,10 @@ find_package(HIP)
 if(HIP_FOUND)
         set(DEFINE_HIP_GPU "#define HIP_GPU")
         set(DEFINE_CUDIFY_USE_HIP "#define CUDIFY_USE_HIP")
+else()
+        #if not HIP we set the MPI wrappers
+        set(CMAKE_C_COMPILER mpicc)
+        set(CMAKE_CXX_COMPILER mpic++)
 endif()
 
 if(HIP_FOUND)