Hi, It looks like the problem with > Undefined symbols for architecture x86_64: > "_iargc_", referenced from: > _MAIN__ in wrf_to_gmt.o > ld: symbol(s) not found for architecture x86_64 actually means what it says, that the iargc intrinsic function from Fortran-77 is no longer supported by gfortran. I thought it was a more general problem of gfortran version not matching gcc, but that was wrong. It looks like for portability you'll have to either use the new Fortran 2003 function COMMAND_ARGUMENT_COUNT(), or make sure you aren't declaring IARGC as an extrinsic function: http://gcc.gnu.org/onlinedocs/gfortran/IARGC.html http://forum.wrfforum.com/viewtopic.php?f=5&t=7 Sorry about the bad advice ... --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: BVS-485205 Department: Support netCDF Priority: Normal Status: Closed