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[netcdfgroup] NetCDF 4.0.1 with --enable-netcdf-4 conflicts with Open MPI by redefining MPI_Comm, etc

Hello,
I have a problem: NetCDF 4.0.1 adds the following lines to netcdf.h (HDF5 is, in fact, built without parallel I/O support.): 

===
/* These defs added by netCDF configure because parallel HDF5 is not present. */ 
#define MPI_Comm int
#define MPI_Info int
#define MPI_COMM_WORLD 0
#define MPI_INFO_NULL 0
===
This (it seems to me) makes it impossible to use MPI (or PETSc) with NetCDF, producing warnings like 
===
/opt/local/include/netcdf.h:43:1: warning: "MPI_COMM_WORLD" redefined
In file included from /Users/constantine/Documents/PISM/petsc-3.0.0-p0/ include/petsc.h:137, from /Users/constantine/Documents/PISM/petsc-3.0.0- p0/include/petscis.h:7, from /Users/constantine/Documents/PISM/petsc-3.0.0- p0/include/petscvec.h:9, from /Users/constantine/Documents/PISM/petsc-3.0.0- p0/include/petscda.h:7, 
                 from ../src/base/grid.cc:20:
===

and errors similar to
===
../src/base/grid.cc:64: error: invalid conversion from ‘int’ to ‘ompi_communicator_t*’ 
===
NetCDF 4.0.1 built without --enable-netcdf-4 works fine with the same code.
Please let me know if this is the intended behavior, if I'm doing something wrong, etc. 

Thank you!
--
Constantine Khroulev
PISM (www.pism-docs.org) Developer/Maintainer
University of Alaska Fairbanks
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