I imagine the following is of little interest to most of the netCDF
community, but perhaps this warning will help some poor lost soul in the
The --disable-v2 flag was introduced into the netCDF configure script at
3.6.2-beta3. It suppresses the building of the netCDF-2 API. However it
causes a problem for some Fortran compilers. The problem arises because
netcdf.inc contains declarations for version 2 functions: nccre, ncopn,
etc (see the section beginning at line 1113, entitled "begin netcdf 2.4
backward compatibility". However these functions do not appear in the
library when --disable-v2 has been used.
So, any time netcdf.inc is included in a Fortran source file there will
be declarations for version-2 functions that are (presumably) not
referenced in the executable code. Some compilers (g77, gfortran) ignore
them, but other compilers (g95, Cray f90) insert entries in the object
file indicating that these functions are undefined and need to be
supplied during linking. With the latter compilers, the linker will give
This is essentially the same compiler-dependent problem that occurred
when a declaration for nf_set_log_level (a netCDF-4 function) was added
by mistake to netcdf.inc in 3.6.2 beta6 or thereabouts.
The solution is pretty obvious: remove the offending lines from
netcdf.inc. At the moment, netcdf.inc is not modified during the netCDF
build process. so you'll need to do that yourself.
Mark Hadfield "Ka puwaha te tai nei, Hoea tahi tatou"
National Institute for Water and Atmospheric Research (NIWA)
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