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Tony, For further diagnosing the failure in large file tests, we'll need more information, including the output from running configure and whatever environment variables you are setting, as specified here: http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-install/Reporting-Problems.html Our tests on an AIX platform worked fine with 4.0 and 4.0.1-beta1, but we haven't run the large file tests on AIX, because we don't have enough disk space on our testing platform. It appears you are only running into problems with large-file tests. I think your installation should complete without problems if you remove the --enable-large-file-tests option from configure. We have output from such a test with CC=xlc CXX=xlC FC=xlf90 F77=xlf using only the configure options --enable-netcdf-4 --with-hdf5=... --with-zlib=... --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: QLD-285503 Department: Support netCDF Priority: Normal Status: Closed