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Provide a way to warn users on the usage of collective IO because of potential MPI-IO bugs for some platforms. Also provide a way for users to give us feedback if the vendor has already fixed the problem so that we can turn off the hard-code macro in our configure description file. Description: See above. Solution: Use a simple MPI complicated derived datatype program to check whether derived data type works for this MPI-IO package. Print out some messages to warn users if not working as we had expected. Platforms tested: AIX 5.1(copper) and Linux 2.4(heping) Misc. update: