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Sean, > No go. I can try to set LD_MATH, but I wouldn't know what to set it > to since I routinely compile statistical packages, databases, and > other scientific software without a problem. Any other suggestions? The file "config.log" contained the following: configure:3582: checking for C const configure:3607: c89 -c -g -O2 conftest.c >&5 c89: invalid option -- 2 The problem is that the CFLAGS environment variable contains the string "-O2", which the compiler doesn't understand. Change the option to just "-O" and retry. Regards, Steve Emmerson Ticket Details =================== Ticket ID: ZYY-472715 Department: Support UDUNITS Priority: Normal Status: Closed