It appears that gfortran is not installed on your system. You can either install gfortran or change the fortran compiler to g77 by editing $NAWIPS/Gemenviron so that set USE_G77=1 is uncommented and set USE_GFORTRAN=1 is commented and then rebuild. Michael James Unidata Ticket Details =================== Ticket ID: XCW-838072 Department: Support GEMPAK Priority: Normal Status: Open