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Hi Mack, Make sure you are linking to both the netCDF Fortran library and the netCDF C library, which in version 4.1.3 are separate libraries. So to link a program with both libraries, you need to use both of -lnetcdff -lnetcdf on the compile/link line. If you didn't include the first of these, it would cause the error messages you are seeing. --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: VZD-784217 Department: Support netCDF Priority: Normal Status: Closed