diff --git a/scripts/setupLC-TPL-uberenv.bash b/scripts/setupLC-TPL-uberenv.bash
index 28776454..2fe2e048 100755
--- a/scripts/setupLC-TPL-uberenv.bash
+++ b/scripts/setupLC-TPL-uberenv.bash
@@ -43,6 +43,7 @@ echo "Building all LC TPLs from $GEOS_BRANCH to be installed at $INSTALL_DIR..."
 
 ./scripts/setupLC-TPL-uberenv-helper.bash $INSTALL_DIR ruby clang-14 "%clang@14.0.6 +docs" "salloc -N 1 -n 1 -t 150 -A vortex" $@ &
 ./scripts/setupLC-TPL-uberenv-helper.bash $INSTALL_DIR ruby gcc-12 "%gcc@12.1.1 +docs" "salloc -N 1 -n 1 -t 150 -A vortex" $@ &
+./scripts/setupLC-TPL-uberenv-helper.bash $INSTALL_DIR ruby gcc-12noAVX "%gcc@12noAVX +docs" "salloc -N 1 -n 1 -t 150 -A vortex" $@ &
 ./scripts/setupLC-TPL-uberenv-helper.bash $INSTALL_DIR dane gcc-12 "%gcc@12.1.1 +docs" "salloc -N 1 -n 1 -t 150 -A vortex" $@ &
 ./scripts/setupLC-TPL-uberenv-helper.bash $INSTALL_DIR lassen gcc-8-cuda-11 "%gcc@8.3.1+cuda~uncrustify cuda_arch=70 ^cuda@11.8.0+allow-unsupported-compilers" "lalloc 1 -W 150" $@ &
 ./scripts/setupLC-TPL-uberenv-helper.bash $INSTALL_DIR lassen clang-13-cuda-11 "%clang@13.0.1+cuda~uncrustify cuda_arch=70 ^cuda@11.8.0+allow-unsupported-compilers" "lalloc 1 -W 150" $@ &
diff --git a/scripts/spack_configs/toss_4_x86_64_ib/spack.yaml b/scripts/spack_configs/toss_4_x86_64_ib/spack.yaml
index 6054c1f2..c1feba9d 100644
--- a/scripts/spack_configs/toss_4_x86_64_ib/spack.yaml
+++ b/scripts/spack_configs/toss_4_x86_64_ib/spack.yaml
@@ -12,11 +12,16 @@
 
 # geosx@develop%clang@14.0.6
 # geosx@develop%gcc@12.1.1
+# geosx@develop%gcc@noAVX
 #
 # Uberenv command to build geos dependencies:
 # python3 ./scripts/uberenv/uberenv.py --spec="%clang@14.0.6 +docs"
 #
 # python3 ./scripts/uberenv/uberenv.py --spec="%gcc@12.1.1 +docs"
+#
+# No AVX instructions
+# python3 ./scripts/uberenv/uberenv.py --spec="%gcc@12noAVX +docs"
+
 
 spack:
   config:
@@ -55,7 +60,23 @@ spack:
         cxx: /usr/tce/packages/gcc/gcc-12.1.1-magic/bin/g++
         f77: /usr/tce/packages/gcc/gcc-12.1.1-magic/bin/gfortran
         fc: /usr/tce/packages/gcc/gcc-12.1.1-magic/bin/gfortran
-      flags: {}
+      operating_system: rhel8
+      target: x86_64
+      modules: []
+      environment:
+        set: # Needed for scotch
+          BISON: bison
+          FLEX: flex
+      extra_rpaths: []
+  - compiler:
+      spec: gcc@12noAVX
+      paths:
+        cc: /usr/tce/packages/gcc/gcc-12.1.1-magic/bin/gcc
+        cxx: /usr/tce/packages/gcc/gcc-12.1.1-magic/bin/g++
+        f77: /usr/tce/packages/gcc/gcc-12.1.1-magic/bin/gfortran
+        fc: /usr/tce/packages/gcc/gcc-12.1.1-magic/bin/gfortran
+      flags:
+        cxxflags: -march=x86-64-v2 -mno-avx512f
       operating_system: rhel8
       target: x86_64
       modules: []
@@ -114,6 +135,8 @@ spack:
       externals:
         - spec: mvapich2@2.3%gcc@12.1.1 process_managers=slurm
           prefix: /usr/tce/packages/mvapich2/mvapich2-2.3.7-gcc-12.1.1-magic
+        - spec: mvapich2@2.3%gcc@12noAVX process_managers=slurm
+          prefix: /usr/tce/packages/mvapich2/mvapich2-2.3.7-gcc-12.1.1-magic
         - spec: mvapich2@2.3%clang@14.0.6 process_managers=slurm
           prefix:  /usr/tce/packages/mvapich2/mvapich2-2.3.7-clang-14.0.6-magic
 
diff --git a/scripts/spack_packages/packages/vtk/package.py b/scripts/spack_packages/packages/vtk/package.py
index 40443461..db5aa7fb 100644
--- a/scripts/spack_packages/packages/vtk/package.py
+++ b/scripts/spack_packages/packages/vtk/package.py
@@ -62,7 +62,7 @@ def cmake_args(self):
             mpi_args = [
                 self.define('CMAKE_C_COMPILER', spec['mpi'].mpicc),
                 self.define('CMAKE_CXX_COMPILER', spec['mpi'].mpicxx),
-                self.define('CMAKE_CXX_FLAGS', self.spec.compiler_flags["cxxflags"]),
+                self.define('CMAKE_CXX_FLAGS', " ".join(self.spec.compiler_flags["cxxflags"])),
                 '-DVTK_USE_MPI=ON',
                 '-DVTK_MODULE_ENABLE_VTK_IOParallelXML=YES',
                 '-DVTK_MODULE_ENABLE_VTK_FiltersParallelDIY2=YES'
@@ -71,7 +71,7 @@ def cmake_args(self):
             mpi_args = [
                 self.define('CMAKE_C_COMPILER', self.compiler.cc),
                 self.define('CMAKE_CXX_COMPILER', self.compiler.cxx),
-                self.define('CMAKE_CXX_FLAGS', self.spec.compiler_flags["cxxflags"]),
+                self.define('CMAKE_CXX_FLAGS', " ".join(self.spec.compiler_flags["cxxflags"])),
                 '-DVTK_USE_MPI=OFF',
                 '-DVTK_MODULE_ENABLE_VTK_IOParallelXML=NO',
                 '-DVTK_MODULE_ENABLE_VTK_FiltersParallelDIY2=NO',