(SOLVED) WRF v4.1.2 compilation error

I am trying to compile WRF v4.1.2 on Linux #1 SMP 3.10.0-1062.12.1.el7.x86_64. I am compiling em_real in WRF using Intel ifort/icc compiler with the dmpar option. My compilation failed when it ran into a problem with "wrf_io.o: In function `ext_ncd_open_for_read_begin_'", with a bunch of error statements indicating undefined reference to 'nf_XXXX', where XXXX is many different variables. I have attached my configure.wrf and compile.log files to this post.

I previously compiled and ran WRF v3.9.1.1 successfully on the same machine with the identical environment settings. However, when I tried to configure WRF v4.1.2, I encountered this error message right off the bat:

************************** W A R N I N G ************************************
NETCDF4 IO features are requested, but this installation of NetCDF
/cvmfs/soft.computecanada.ca/easybuild/software/2017/avx2/MPI/intel2018.3/openmpi3.1/netcdf-fortan-mpi/4.4.4
DOES NOT support these IO features.

Please make sure NETCDF version is 4.1.3 or later and was built with
--enable-netcdf4

OR set NETCDF_classic variable
bash/ksh : export NETCDF_classic=1
echo csh : setenv NETCDF_classic 1

Then re-run this configure script

!!! configure.wrf has been REMOVED !!!

*****************************************************************************

so I added 'export NETCDF_classic=1' in my .bashrc file according to its suggestion. Doing so avoided the error while configuring the model, but then I encountered the above error while compiling em_real. I am not too sure whether these issues are related.

Any help would be greatly appreciated. Thank you!

Problem solved.

I was trying to compile it on Cedar, one of Compute Canada's HPC machines. It turns out that I still need to load the WRF module on the machine first for it to compile successfully, despite I had copied all of the WRF source codes from the system's software base directory to my working directory and pointed to the required NetCDF library in my environment setup file.

I still don't fully understand the cause of the problem, but it seems like WRF's ./compile program won't be able to find or link to the correct NetCDF library unless I have loaded the correct version of the WRF module on the machine. So it might be a machine-specific issue.

Where in basch file did you add export NETCDF_classic = 1?

Hi,
It shouldn't matter where in the .bashrc you add that line, but you will need to make sure to source the file to ensure the command is incorporated into the environment:
You could also just set it in your command line prior to compiling.