Error while compiling OBSGRID during model setup on Ubuntu 24.04

[vin360airquality]

Hi everyone,


I'm currently setting up the OBSGRID model and encountered multiple errors during the compilation process. I would appreciate any help in resolving these issues.

System Information:​

• OS: [Ubuntu 24.04]
• Compiler: gfortran [version]
• NetCDF version: 4.7.4 (installed via Conda)
• OBSGRID version:GitHub - wrf-model/OBSGRID: Repository for OBSGRID
• Environment variables:
  
  export NETCDF=/home/air360/miniconda3
  export PATH=$NETCDF/bin:$PATH
  export LD_LIBRARY_PATH=$NETCDF/lib:$LD_LIBRARY_PATH
  export CPATH=$NETCDF/include:$CPATH
  export LIBRARY_PATH=$NETCDF/lib:$LIBRARY_PATH

---

Error Summary:​

1. Fatal error: Cannot open included file ‘netcdf.inc’
   pgsql
   CopyEdit
   main.f:29:0:
   29 | INCLUDE 'netcdf.inc'
   |
   Fatal Error: Cannot open included file ‘netcdf.inc’
   compilation terminated.
   • The file netcdf.inc is missing or not being found.
   • Checked: NetCDF is installed at /home/air360/miniconda3, and its include directory contains netcdf.h but not netcdf.inc.
2. Fatal Error: Cannot open module file ‘observation.mod’
   lua
   CopyEdit
   driver.f:29:8:
   29 | USE observation
   | 1
   Fatal Error: Cannot open module file ‘observation.mod’ for reading at (1): No such file or directory
   • observation.mod is missing, which suggests that it either:
     • Failed to compile earlier
     • Was not generated properly due to errors in dependencies
3. Linker errors: Missing .o files
   yaml
   CopyEdit
   /usr/bin/ld: cannot find driver.o: No such file or directory
   /usr/bin/ld: cannot find main.o: No such file or directory
   /usr/bin/ld: cannot find proc_final_analysis.o: No such file or directory
   collect2: error: ld returned 1 exit status
   • Many .o object files are missing, which suggests:
     • Errors in previous compilation steps
     • Dependencies not being built properly before linking

---

Steps I Have Tried:​

1. Checked NetCDF installation
   • Running nc-config --all shows NetCDF is installed and paths are set.
   • But netcdf.inc is missing from /home/air360/miniconda3/include/.
2. Recompiling with modified preprocessor settings
   • Edited configure.oa to change:
     ini
     CopyEdit
     CPP = /usr/bin/cpp -C -P -traditional
     to:
     ini
     CopyEdit
     CPP = /usr/bin/cpp -C -P -traditional-cpp
3. Reinstalling NetCDF-Fortran:
   bash
   CopyEdit
   conda install -c conda-forge netcdf-fortran
   But the error "Cannot open included file ‘netcdf.inc’" still appears.
4. Cleaning and recompiling:
   bash
   CopyEdit
   make clean
   make
   • Compilation still fails at the same point.

---

Request for Help​

• Has anyone encountered a similar issue while compiling OBSGRID?
• Do I need a specific NetCDF-Fortran version to include netcdf.inc?
• Any advice on fixing observation.mod and ensuring dependencies compile properly?

Thank you for any suggestions!

 

[kwerner]

Hi,
When you install netCDF, are you installing both netcdf-c and netcdf-fortran, and making sure all the binaries, libraries, and include files are in the same directories? For e.g., having a directory called "netcdf" that includes the directories bin, lib, and include - where files from both builds reside?

Do you have the variable NETCDF set to the path with both netcdfs are built?