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Hi, The error message indicates that the cygwin program "cmp" cannot be found. Please check that you path is set properly to include the directory where cygwin programs such as "cmp" are installed. You may have not installed the "diffutils" packages from cygwin yet. To see how to check, look in the Cygwin FAQ here: http://cygwin.com/faq/faq-nochunks.html#faq.setup.what-packages You most likely need to download and install this: http://cygwin.com/cgi-bin2/package-grep.cgi?grep=bin%2Fcmp.exe Let us know if this still doesn't work after installing the "cmp" program. --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: TIA-260609 Department: Support netCDF Priority: Normal Status: Closed