configure: error: netcdf.h could not be found. Please set CPPFLAGS.

This error occurs during the configuration of some software that requires the NetCDF library. The error message indicates that the header file "netcdf.h" could not be found, which means that the library is not installed on the system or the path to the library is not set correctly.

To resolve this error, the following steps can be taken:

1. Install the NetCDF library. Depending on the operating system, the installation process may differ. For example, on Ubuntu, the library can be installed by running the following command:

   sudo apt-get install libnetcdf-dev
   

2. Set the CPPFLAGS environment variable to include the path to the NetCDF header files. This can be done by running the following command:

   export CPPFLAGS="-I/path/to/netcdf/include"
   

   Replace "/path/to/netcdf/include" with the actual path to the NetCDF header files on the system.

3. Re-run the configuration command for the software that was giving the error.

By following these steps, the software should be able to find the NetCDF header files and complete the configuration process.