diff --git a/bot/build.sh b/bot/build.sh
index 5c9f1af0..e6879e86 100755
--- a/bot/build.sh
+++ b/bot/build.sh
@@ -161,16 +161,6 @@ EESSI_SOFTWARE_SUBDIR_OVERRIDE=${EESSI_SOFTWARE_SUBDIR_OVERRIDE:-${CPU_TARGET}}
 export EESSI_SOFTWARE_SUBDIR_OVERRIDE
 echo "bot/build.sh: EESSI_SOFTWARE_SUBDIR_OVERRIDE='${EESSI_SOFTWARE_SUBDIR_OVERRIDE}'"
 
-# determine accelerator target (if any) from .architecture in ${JOB_CFG_FILE}
-ACCEL_OVERRIDE=$(cfg_get_value "architecture" "accelerator")
-if [[ -n "$ACCEL_OVERRIDE" ]]; then
-    # bot job config does not include accel subdirectory
-    export EESSI_ACCELERATOR_TARGET_OVERRIDE="accel/$ACCEL_OVERRIDE"
-else
-    export EESSI_ACCELERATOR_TARGET_OVERRIDE=""
-fi
-echo "bot/build.sh: EESSI_ACCELERATOR_TARGET_OVERRIDE='${EESSI_ACCELERATOR_TARGET_OVERRIDE}'"
-
 # Log the full lscpu and os-release info:
 lscpu > _bot_job${SLURM_JOB_ID}.lscpu
 cat /etc/os-release > _bot_job${SLURM_JOB_ID}.os
@@ -259,11 +249,38 @@ fi
 # create tmp file for output of build step
 build_outerr=$(mktemp build.outerr.XXXX)
 
-echo "Executing command to build software:"
-echo "$software_layer_dir/eessi_container.sh ${COMMON_ARGS[@]} ${BUILD_STEP_ARGS[@]}"
-echo "                     -- $software_layer_dir/install_software_layer.sh \"${INSTALL_SCRIPT_ARGS[@]}\" \"$@\" 2>&1 | tee -a ${build_outerr}"
-$software_layer_dir/eessi_container.sh "${COMMON_ARGS[@]}" "${BUILD_STEP_ARGS[@]}" \
-                     -- $software_layer_dir/install_software_layer.sh "${INSTALL_SCRIPT_ARGS[@]}" "$@" 2>&1 | tee -a ${build_outerr}
+# determine accelerator target (if any) from .architecture in ${JOB_CFG_FILE}
+ACCEL_OVERRIDES=$(cfg_get_value "architecture" "accelerator")
+IFS='+' read -ra ACCEL_OVERRIDES_ARRAY <<< "$ACCEL_OVERRIDES"
+# prepend accel/ to all array elements
+EESSI_ACCELERATOR_TARGET_OVERRIDES=("${ACCEL_OVERRIDES_ARRAY[@]/#/accel/}")
+if [[ -n "$ACCEL_OVERRIDES" ]]; then
+    for ACCEL_OVERRIDE in "${EESSI_ACCELERATOR_TARGET_OVERRIDES[@]}"; do
+        # bot job config does not include accel subdirectory
+        #export EESSI_ACCELERATOR_TARGET_OVERRIDE="accel/${ACCEL_OVERRIDE}"
+        #echo "bot/build.sh: EESSI_ACCELERATOR_TARGET_OVERRIDE='accel/${ACCEL_OVERRIDE}'"
+        export EESSI_ACCELERATOR_TARGET_OVERRIDE="${ACCEL_OVERRIDE}"
+        echo "bot/build.sh: EESSI_ACCELERATOR_TARGET_OVERRIDE='${ACCEL_OVERRIDE}'"
+        echo "Executing command to build software:"
+        echo "$software_layer_dir/eessi_container.sh ${COMMON_ARGS[@]} ${BUILD_STEP_ARGS[@]}"
+        echo "                     -- $software_layer_dir/install_software_layer.sh \"${INSTALL_SCRIPT_ARGS[@]}\" \"$@\" 2>&1 | tee -a ${build_outerr}"
+        $software_layer_dir/eessi_container.sh "${COMMON_ARGS[@]}" "${BUILD_STEP_ARGS[@]}" \
+                             -- $software_layer_dir/install_software_layer.sh "${INSTALL_SCRIPT_ARGS[@]}" "$@" 2>&1 | tee -a ${build_outerr}
+
+        # determine temporary directory to resume from for the next accelerator,
+        # as we want to combine all accelerator builds into a single tarball in the end
+        BUILD_TMPDIR=$(grep ' as tmp directory ' ${build_outerr} | cut -d ' ' -f 2)
+        BUILD_STEP_ARGS+=("--resume" "${BUILD_TMPDIR}")
+    done
+else
+    export EESSI_ACCELERATOR_TARGET_OVERRIDE=""
+    echo "Executing command to build software:"
+    echo "$software_layer_dir/eessi_container.sh ${COMMON_ARGS[@]} ${BUILD_STEP_ARGS[@]}"
+    echo "                     -- $software_layer_dir/install_software_layer.sh \"${INSTALL_SCRIPT_ARGS[@]}\" \"$@\" 2>&1 | tee -a ${build_outerr}"
+    $software_layer_dir/eessi_container.sh "${COMMON_ARGS[@]}" "${BUILD_STEP_ARGS[@]}" \
+                         -- $software_layer_dir/install_software_layer.sh "${INSTALL_SCRIPT_ARGS[@]}" "$@" 2>&1 | tee -a ${build_outerr}
+fi
+echo "bot/build.sh: EESSI_ACCELERATOR_TARGET_OVERRIDE='${EESSI_ACCELERATOR_TARGET_OVERRIDE}'"
 
 # prepare directory to store tarball of tmp for tarball step
 TARBALL_TMP_TARBALL_STEP_DIR=${PREVIOUS_TMP_DIR}/tarball_step
@@ -291,14 +308,15 @@ else
 fi
 # to set EESSI_VERSION we need to source init/eessi_defaults now
 source $software_layer_dir/init/eessi_defaults
-# Note: if ${EESSI_DEV_PROJECT} is defined (building for dev.eessi.io), then we 
+# Note: if ${EESSI_DEV_PROJECT} is defined (building for dev.eessi.io), then we
 # append the project (subdirectory) name to the end tarball name. This is information
 # then used at the ingestion stage. If ${EESSI_DEV_PROJECT} is not defined, nothing is
 # appended
 if [[ -z ${EESSI_ACCELERATOR_TARGET_OVERRIDE} ]]; then
     export TARBALL=$(printf "eessi-%s-software-%s-%s-%b%d.${tarball_extension}" ${EESSI_VERSION} ${EESSI_OS_TYPE} ${EESSI_SOFTWARE_SUBDIR_OVERRIDE//\//-} ${EESSI_DEV_PROJECT:+$EESSI_DEV_PROJECT-} ${timestamp})
 else
-    export TARBALL=$(printf "eessi-%s-software-%s-%s-%s-%b%d.${tarball_extension}" ${EESSI_VERSION} ${EESSI_OS_TYPE} ${EESSI_SOFTWARE_SUBDIR_OVERRIDE//\//-} ${EESSI_ACCELERATOR_TARGET_OVERRIDE//\//-} ${EESSI_DEV_PROJECT:+$EESSI_DEV_PROJECT-} ${timestamp})
+    #export TARBALL=$(printf "eessi-%s-software-%s-%s-%s-%b%d.${tarball_extension}" ${EESSI_VERSION} ${EESSI_OS_TYPE} ${EESSI_SOFTWARE_SUBDIR_OVERRIDE//\//-} ${EESSI_ACCELERATOR_TARGET_OVERRIDE//\//-} ${EESSI_DEV_PROJECT:+$EESSI_DEV_PROJECT-} ${timestamp})
+    export TARBALL=$(printf "eessi-%s-software-%s-%s-%s-%b%d.${tarball_extension}" ${EESSI_VERSION} ${EESSI_OS_TYPE} ${EESSI_SOFTWARE_SUBDIR_OVERRIDE//\//-} accel ${EESSI_DEV_PROJECT:+$EESSI_DEV_PROJECT-} ${timestamp})
 fi
 
 # Export EESSI_DEV_PROJECT to use it (if needed) when making tarball
@@ -312,8 +330,8 @@ export EESSI_DEV_PROJECT=${EESSI_DEV_PROJECT}
 TMP_IN_CONTAINER=/tmp
 echo "Executing command to create tarball:"
 echo "$software_layer_dir/eessi_container.sh ${COMMON_ARGS[@]} ${TARBALL_STEP_ARGS[@]}"
-echo "                     -- $software_layer_dir/create_tarball.sh ${TMP_IN_CONTAINER} ${EESSI_VERSION}${EESSI_SOFTWARE_LAYER_VERSION_SUFFIX} ${EESSI_SOFTWARE_SUBDIR_OVERRIDE} \"${EESSI_ACCELERATOR_TARGET_OVERRIDE}\" /eessi_bot_job/${TARBALL} 2>&1 | tee -a ${tar_outerr}"
+echo "                     -- $software_layer_dir/create_tarball.sh ${TMP_IN_CONTAINER} ${EESSI_VERSION}${EESSI_SOFTWARE_LAYER_VERSION_SUFFIX} ${EESSI_SOFTWARE_SUBDIR_OVERRIDE} \"${EESSI_ACCELERATOR_TARGET_OVERRIDES[@]}\" /eessi_bot_job/${TARBALL} 2>&1 | tee -a ${tar_outerr}"
 $software_layer_dir/eessi_container.sh "${COMMON_ARGS[@]}" "${TARBALL_STEP_ARGS[@]}" \
-                     -- $software_layer_dir/create_tarball.sh ${TMP_IN_CONTAINER} ${EESSI_VERSION}${EESSI_SOFTWARE_LAYER_VERSION_SUFFIX} ${EESSI_SOFTWARE_SUBDIR_OVERRIDE} "${EESSI_ACCELERATOR_TARGET_OVERRIDE}" /eessi_bot_job/${TARBALL} 2>&1 | tee -a ${tar_outerr}
+                     -- $software_layer_dir/create_tarball.sh ${TMP_IN_CONTAINER} ${EESSI_VERSION}${EESSI_SOFTWARE_LAYER_VERSION_SUFFIX} ${EESSI_SOFTWARE_SUBDIR_OVERRIDE} $(printf '%q ' "${EESSI_ACCELERATOR_TARGET_OVERRIDES[@]}") /eessi_bot_job/${TARBALL} 2>&1 | tee -a ${tar_outerr}
 
 exit 0
diff --git a/create_tarball.sh b/create_tarball.sh
index d3251ba1..5f8dc8aa 100755
--- a/create_tarball.sh
+++ b/create_tarball.sh
@@ -11,7 +11,7 @@ fi
 eessi_tmpdir=$1
 eessi_version=$2
 cpu_arch_subdir=$3
-accel_subdir=$4
+accel_subdirs="$4"
 target_tarball=$5
 
 tmpdir=`mktemp -d`
@@ -64,11 +64,21 @@ fi
 
 # consider both CPU-only and accelerator subdirectories (if an accelerator was configured)
 sw_subdirs=${cpu_arch_subdir}
-if [ -n "${accel_subdir}" ]; then
-    sw_subdirs="${sw_subdirs} ${cpu_arch_subdir}/${accel_subdir}"
+echo "accel_subdirs 1: ${accel_subdirs}"
+if [ -n "${accel_subdirs}" ]; then
+    # convert accel_subdirs into an array...
+    #read -r -a accel_subdirs <<< ${accel_subdirs}
+    #mapfile -t accel_subdirs <<< "$accel_subdirs"
+    eval "accel_subdirs=(${accel_subdirs})"
+    echo "accel_subdirs 2: ${accel_subdirs}"
+    # and prepend the cpu_arch_subdir to all elements
+    accel_subdirs="${accel_subdirs[@]/#/${cpu_arch_subdir}/}"
+    echo "accel_subdirs 3: ${accel_subdirs}"
+    sw_subdirs="${sw_subdirs} ${accel_subdirs[@]}"
 fi
 for subdir in ${sw_subdirs}; do
 
+    echo "subdir: ${subdir}"
     if [ -d ${eessi_version}/software/${os}/${subdir}/modules ]; then
         # module files
         find ${eessi_version}/software/${os}/${subdir}/modules -type f \! -name '.wh.*' >> ${files_list}
diff --git a/easystacks/software.eessi.io/2025.06/accel/nvidia/eessi-2025.06-eb-5.3.0.yml b/easystacks/software.eessi.io/2025.06/accel/nvidia/eessi-2025.06-eb-5.3.0.yml
new file mode 100644
index 00000000..66a4a1f9
--- /dev/null
+++ b/easystacks/software.eessi.io/2025.06/accel/nvidia/eessi-2025.06-eb-5.3.0.yml
@@ -0,0 +1,2 @@
+easyconfigs:
+  - pmt-1.3.1-GCCcore-13.3.0-CUDA-12.6.0.eb