Hi Eshani,
Please review the following tips.
It would help us to know what compiler you are using.
Did you try this tutorial? https://github.com/USEPA/CMAQ/blob/master/DOCS/Users_Guide/Tutorials/CMAQ_UG_tutorial_build_library_gcc.md
The above tutorial gives instructions on how to build the netCDF C, netCDF Fortran, and I/O API Libraries that are required to build CMAQ.
Thanks, Liz
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