diff --git a/roughpaper/build_compile_test.sh b/roughpaper/build_compile_test.sh
index 537b7444f..365b4c0d6 100755
--- a/roughpaper/build_compile_test.sh
+++ b/roughpaper/build_compile_test.sh
@@ -37,7 +37,7 @@ gcc="/sw/spack-levante/gcc-11.2.0-bcn7mb/bin/gcc"
 CC=${gcc}               # C
 CXX=${gxx}              # C++
 
-CMAKE_CXX_FLAGS="-Werror -Wall -pedantic -g -gdwarf-4 -O0 -mpc64"      # correctness and debugging (note -gdwarf-4 not possible for nvc++)
+CMAKE_CXX_FLAGS="-Werror -Wall -Wextra -pedantic -g -gdwarf-4 -O0 -mpc64"      # correctness and debugging (note -gdwarf-4 not possible for nvc++)
 # CMAKE_CXX_FLAGS="-Werror -Wall -pedantic -O3"                            # performance
 ### ---------------------------------------------------- ###
 
@@ -51,11 +51,6 @@ CUDA_ROOT="/sw/spack-levante/nvhpc-23.9-xpxqeo/Linux_x86_64/23.9/cuda/"
 NVCC_WRAPPER_DEFAULT_COMPILER=${gxx}
 ### ---------------------------------------------------- ###
 
-### ------------ choose extra compiler flags ----------- ###
-CMAKE_CXX_FLAGS="-Wall -pedantic -g -gdwarf-4 -O0 -mpc64"      # correctness and debugging (note -gdwarf-4 not possible for nvc++)
-#CMAKE_CXX_FLAGS="-Werror -Wall -pedantic -O3"                 # performance
-### ---------------------------------------------------- ###
-
 ### ------------ choose Kokkos configuration ----------- ###
 # flags for serial kokkos
 kokkosflags="-DKokkos_ARCH_NATIVE=ON -DKokkos_ARCH_AMPERE80=ON -DKokkos_ENABLE_SERIAL=ON"
diff --git a/scripts/bash/build_cleo_cuda_openmp.sh b/scripts/bash/build_cleo_cuda_openmp.sh
index 82950e775..f5d2c9389 100755
--- a/scripts/bash/build_cleo_cuda_openmp.sh
+++ b/scripts/bash/build_cleo_cuda_openmp.sh
@@ -37,7 +37,7 @@ path2build=$2   # get from command line argument
 CC=${gcc}               # C
 CXX=${gxx}              # C++
 
-# CMAKE_CXX_FLAGS="-Werror -Wall -pedantic -g -gdwarf-4 -O0 -mpc64"      # correctness and debugging (note -gdwarf-4 not possible for nvc++)
+# CMAKE_CXX_FLAGS="-Werror -Wall -Wextra -pedantic -g -gdwarf-4 -O0 -mpc64"      # correctness and debugging (note -gdwarf-4 not possible for nvc++)
 CMAKE_CXX_FLAGS="-Werror -Wall -pedantic -O3"                            # performance
 ### ---------------------------------------------------- ###
 
diff --git a/scripts/bash/build_cleo_openmp.sh b/scripts/bash/build_cleo_openmp.sh
index 320248e08..dac713d05 100755
--- a/scripts/bash/build_cleo_openmp.sh
+++ b/scripts/bash/build_cleo_openmp.sh
@@ -35,7 +35,7 @@ path2build=$2   # get from command line argument
 CC=${gcc}               # C
 CXX=${gxx}              # C++
 
-# CMAKE_CXX_FLAGS="-Werror -Wall -pedantic -g -gdwarf-4 -O0 -mpc64"      # correctness and debugging (note -gdwarf-4 not possible for nvc++)
+# CMAKE_CXX_FLAGS="-Werror -Wall -Wextra -pedantic -g -gdwarf-4 -O0 -mpc64"      # correctness and debugging (note -gdwarf-4 not possible for nvc++)
 CMAKE_CXX_FLAGS="-Werror -Wall -pedantic -O3"                            # performance
 ### ---------------------------------------------------- ###
 
diff --git a/scripts/bash/build_cleo_serial.sh b/scripts/bash/build_cleo_serial.sh
index ddd01f66f..4644cea75 100755
--- a/scripts/bash/build_cleo_serial.sh
+++ b/scripts/bash/build_cleo_serial.sh
@@ -35,7 +35,7 @@ path2build=$2   # get from command line argument
 CC=${gcc}               # C
 CXX=${gxx}              # C++
 
-# CMAKE_CXX_FLAGS="-Werror -Wall -pedantic -g -gdwarf-4 -O0 -mpc64"      # correctness and debugging (note -gdwarf-4 not possible for nvc++)
+# CMAKE_CXX_FLAGS="-Werror -Wall -Wextra -pedantic -g -gdwarf-4 -O0 -mpc64"      # correctness and debugging (note -gdwarf-4 not possible for nvc++)
 CMAKE_CXX_FLAGS="-Werror -Wall -pedantic -O3"                            # performance
 ### ---------------------------------------------------- ###