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Sean, > I should have mentioned--there is the config.log file, which I am > attaching, in case that is what you need. Yes. I meant the file "config.log". My mistake. That file contained the following: configure:2590: checking for c89 option to accept ANSI C configure:2660: c89 -c -g -O2 conftest.c >&5 c89: invalid option -- 2 Did the environment variable CFLAGS contain the string "-O2"? If so, then please change it to just "-O" and re-execute the configure script. Let me know if this helps. Regards, Steve Emmerson Ticket Details =================== Ticket ID: ZYY-472715 Department: Support UDUNITS Priority: Normal Status: Closed