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Howdy Andrew, From your configure file: configure:24083: pgf95 -o conftest -g conftestf.o conftest.o ld: warning in conftest.o, file is not of required architecture Undefined symbols: "_sub_", referenced from: _MAIN_ in conftestf.o Looks like your computer is confused about whether it should produce 32 bit of 64 bit code. If you are using 32-bit fortran, and the GNU C compiler, you must set CFLAGS to -m32 to make gcc produce 32-bit code. (Do the same to CXXFLAGS if you want the C++ API). Please let me know if this doesn't help. Thanks, Ed Ticket Details =================== Ticket ID: WAD-188926 Department: Support netCDF Priority: Normal Status: Closed