Intended way to generate MPI.jl compatible C bindings

I am currently trying to generate MPI.jl compatible bindings of the C library HYPRE with the help Clang.jl . The current generator (found here https://github.com/termi-official/HYPRE.jl/blob/master/gen/generator.jl) creates files that have incompatible data types (see e.g. https://github.com/termi-official/HYPRE.jl/blob/master/lib/LibHYPRE.jl#L6), so I was wondering what the intended way to grab the correct MPI headers and data type definitions is?

cc @fredrikekre @Gnimuc