Yolande, > is #define in udunits.inc a C language command or FORTRAN? I don't use > > #include 'udunits.inc' > > in my FORTRAN programs as I would for a C header file. I use > > include 'udunits.inc' > > which is correct for a FORTRAN header file. Which is correct? When the UDUNITS package was developed, there was no standard for including header-files in Fortran. Therefore, the C way of including header-files was chosen because all Fortran compilers can preprocess their input using the C preprocessor. I have to go eat. Regards, Steve Emmerson Ticket Details =================== Ticket ID: QKV-165487 Department: Support UDUNITS Priority: Normal Status: On Hold