diff --git a/modulefiles/GDAS/hercules.gnu.lua b/modulefiles/GDAS/hercules.gnu.lua
new file mode 100644
index 00000000..c025b528
--- /dev/null
+++ b/modulefiles/GDAS/hercules.gnu.lua
@@ -0,0 +1,94 @@
+help([[
+Load environment for running the GDAS application with gnu compilers and MPI.
+]])
+
+local pkgName    = myModuleName()
+local pkgVersion = myModuleVersion()
+local pkgNameVer = myModuleFullName()
+
+prepend_path("MODULEPATH", '/work/noaa/epic/role-epic/spack-stack/hercules/modulefiles')
+prepend_path("MODULEPATH", '/work/noaa/epic/role-epic/spack-stack/hercules/spack-stack-1.7.0/envs/ue-gcc/install/modulefiles/Core')
+prepend_path("MODULEPATH", '/work2/noaa/da/python/opt/modulefiles/stack')
+
+
+---- below two lines get us access to the spack-stack modules
+load("stack-gcc/12.2.0")
+load("stack-openmpi/4.1.6")
+
+load("cmake/3.23.1")
+load("curl/8.4.0")
+load("zlib/1.2.13")
+load("git/2.31.1")
+--load("pkg-config/0.27.1")
+load("hdf5/1.14.3")
+load("parallel-netcdf/1.12.3")
+load("netcdf-c/4.9.2")
+load("nccmp/1.9.0.1")
+load("netcdf-fortran/4.6.1")
+load("nco/5.1.6")
+load("parallelio/2.6.2")
+load("wget/1.21.1")
+load("boost/1.84.0")
+load("bufr/12.0.1")
+load("git-lfs/3.1.2")
+load("ecbuild/3.7.2")
+load("openjpeg/2.3.1")
+load("eccodes/2.33.0")
+load("eigen/3.4.0")
+load("openblas/0.3.24")
+load("eckit/1.24.5")
+load("fftw/3.3.10")
+load("fckit/0.11.0")
+load("fiat/1.2.0")
+load("ectrans/1.2.0")
+load("fms/2023.04")
+load("esmf/8.6.1")
+load("atlas/0.36.0")
+load("sp/2.5.0")
+load("gsl-lite/0.37.0")
+load("libjpeg/2.1.0")
+load("krb5/1.20.1")
+load("libtirpc/1.3.3")
+load("hdf/4.2.15")
+load("jedi-cmake/1.4.0")
+load("libpng/1.6.37")
+load("libxt/1.3.0")
+load("libxmu/1.1.4")
+load("libxpm/3.5.17")
+load("libxaw/1.0.15")
+load("udunits/2.2.28")
+load("ncview/2.1.9")
+load("netcdf-cxx4/4.3.1")
+load("py-pybind11/2.11.0")
+--load("crtm/v2.4_jedi")
+load("contrib/0.1")
+load("noaatools/3.1")
+load("rocoto/1.3.7")
+
+load("hpc/1.2.0")
+unload("python/3.10.13")
+unload("py-numpy/1.22.3")
+load("miniconda3/4.6.14")
+load("gdasapp/1.0.0")
+-- below is a hack because of cmake finding the wrong python...
+setenv("CONDA_PREFIX", "/work2/noaa/da/python/opt/core/miniconda3/4.6.14/envs/gdasapp/")
+
+setenv("CC","mpicc")
+setenv("FC","mpifort")
+setenv("CXX","mpicxx")
+local mpiexec = '/opt/slurm/bin/srun'
+local mpinproc = '-n'
+setenv('MPIEXEC_EXEC', mpiexec)
+setenv('MPIEXEC_NPROC', mpinproc)
+
+setenv("CRTM_FIX","/work2/noaa/da/role-da/GDASApp/fix/crtm/2.4.0")
+setenv("GDASAPP_TESTDATA","/work2/noaa/da/role-da/GDASApp/testdata")
+setenv("GDASAPP_UNIT_TEST_DATA_PATH", "/work2/noaa/da/role-da/GDASApp/unittestdata")
+prepend_path("PATH","/apps/contrib/NCEP/libs/hpc-stack/intel-2018.4/prod_util/1.2.2/bin")
+
+execute{cmd="ulimit -s unlimited",modeA={"load"}}
+
+whatis("Name: ".. pkgName)
+whatis("Version: ".. pkgVersion)
+whatis("Category: GDASApp")
+whatis("Description: Load all libraries needed for GDASApp")