Andreas,
I'm afraid that the Fortran-90 interface of the netCDF package cannot be
built on a NEC SX-5. The reason may be found at
http://www.unidata.ucar.edu/glimpse/netcdf/4473
In fact, the entire email exchange may be useful to you. Search for
"200111300742.fAU7gvN29708" on the netCDF support-email archive page at
http://www.unidata.ucar.edu/glimpsedocs/ghnetcdf.html
If you want to try the solution outlined in the first URL above, then let
me know and I'll try to help.
Regards,
Steve Emmerson <http://www.unidata.ucar.edu>