This can be built under the NOAA hpc-stack (https://github.com/NOAA-EMC/hpc-stack).
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If the only goal is to build GSI/EnKF, one can clone the hpc-stack code from this fork https://github.com/comgsi/hpc-stack where customized config_comgsi.sh and stack_comgsi.sh are provided to build only those libraries required by GSI/EnKF.
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To use the authoritative NOAA hpc-stack and add the gsiwrfio libary, you can follow changes shown here https://github.com/comgsi/hpc-stack/compare/f53255a..a639980
Once completed, you can follow the hpc-stack practices to use module load gsiwrfio/1.0.0 to set gsiwrfio related environmental variables.
You can also elect to build the gsiwrfio library independently as follows and set the GSIWRFIO_LIB environmental variable to let GSI/EnKF know where to find the gsiwrfio library.
git clone https://github.com/comgsi/gsiwrfio.git
(... make sure your environment has a valid compiler, mpi and netcdf ...)
cd gsiwrfio
mkdir build
cd build
cmake ..
make -j2
Once completed, you will find libgsiwrfio.a under build/src/
Run the following command to set the GSIWRFIO_LIB environmental variable before build GSI/EnKF:
export GSIWRFIO_LIB="/path/to/libgsiwrfio.a" # use setenv for csh-type shells