diff --git a/.gitmodules b/.gitmodules
index 2f6cb0566..eb862fd1a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,5 +4,8 @@
   branch = spack-stack-dev
 [submodule "repos/builtin"]
   path = repos/builtin
-  url = https://github.com/jcsda/spack-packages
-  branch = spack-stack-dev
+  #url = https://github.com/jcsda/spack-packages
+  #branch = spack-stack-dev
+  # https://github.com/JCSDA/spack-packages/pull/57
+  url = https://github.com/climbfuji/spack-packages
+  branch = bugfix/scalasca_scorep_spack_stack_dev
diff --git a/configs/common/packages.yaml b/configs/common/packages.yaml
index 399bf4ba9..d55881667 100644
--- a/configs/common/packages.yaml
+++ b/configs/common/packages.yaml
@@ -463,6 +463,8 @@ packages:
     py-versioneer:
       require:
       - '@0.29'
+    # On a per-site basis, either set qt to buildable: false
+    # or add requirement to build with gcc for Intel oneAPI
     qt:
       require:
       - '@5'
diff --git a/configs/common/packages_oneapi.yaml b/configs/common/packages_oneapi.yaml
index e6516bcab..ddb3aae72 100644
--- a/configs/common/packages_oneapi.yaml
+++ b/configs/common/packages_oneapi.yaml
@@ -71,9 +71,9 @@ packages:
     py-scipy:
       require:
       - 'cxxflags="-O1"'
-    qt:
-      require:
-      - '%c,cxx=gcc'
+    #qt:
+    #  require:
+    #  - '%c,cxx=gcc'
     rust:
       require:
       - '%c,cxx=gcc'
diff --git a/configs/sites/tier1/blueback/packages_oneapi-2026.0.0.yaml b/configs/sites/tier1/blueback/packages_oneapi-2026.0.0.yaml
new file mode 100644
index 000000000..427de65e2
--- /dev/null
+++ b/configs/sites/tier1/blueback/packages_oneapi-2026.0.0.yaml
@@ -0,0 +1,62 @@
+packages:
+  all:
+    require:
+    - any_of: ['%intel-oneapi-compilers@=2026.0.0']
+      when: '%intel-oneapi-compilers'
+    - any_of: ['%gcc@=13.3.0']
+      when: '%gcc'
+  mpi:
+    buildable: false
+    require:
+    - cray-mpich@8.1.32
+  intel-oneapi-compilers:
+    buildable: false
+    externals:
+    - spec: intel-oneapi-compilers@2026.0.0 +fix_rt_linkage
+      prefix: /p/app/intel/oneapi-combined
+      modules:
+      - PrgEnv-intel/8.6.0
+      - intel-oneapi/2026.0.0
+      extra_attributes:
+        compilers:
+          c: /p/app/projects/NEPTUNE/spack-stack/oneapi-2026.0.0/2026.0/bin/icx
+          cxx: /p/app/projects/NEPTUNE/spack-stack/oneapi-2026.0.0/2026.0/bin/icpx
+          fortran: /p/app/projects/NEPTUNE/spack-stack/oneapi-2026.0.0/2026.0/bin/ifx
+        environment:
+          set:
+            CONFIG_SITE: ''
+  gcc:
+    buildable: false
+    externals:
+    - spec: gcc@13.3.0 languages:='c,c++'
+      prefix: /usr
+      modules:
+      - PrgEnv-gnu/8.6.0
+      - gcc-native/13.2
+      extra_attributes:
+        compilers:
+          c: /usr/bin/gcc
+          cxx: /usr/bin/g++
+          fortran: /usr/bin/gfortran
+        environment:
+          set:
+            CONFIG_SITE: ''
+            PE_GCC_EXTERNAL: native
+  cray-mpich:
+    buildable: false
+    externals:
+    - spec: cray-mpich@8.1.32
+      prefix: /opt/cray/pe/mpich/8.1.32/ofi/INTEL/2022.1
+      modules:
+      - libfabric/1.22.0
+      - craype-network-ofi
+      - cray-mpich/8.1.32
+      extra_attributes:
+        environment:
+          prepend_path:
+            CMAKE_PREFIX_PATH: /p/app/projects/NEPTUNE/spack-stack/cmake-findmpi
+  intel-oneapi-mkl:
+    buildable: false
+    externals:
+    - spec: intel-oneapi-mkl@2026.0
+      prefix: /p/app/projects/NEPTUNE/spack-stack/oneapi-2026.0.0
diff --git a/configs/sites/tier2/bounty/packages.yaml b/configs/sites/tier2/bounty/packages.yaml
index c63f61987..19593bb9f 100644
--- a/configs/sites/tier2/bounty/packages.yaml
+++ b/configs/sites/tier2/bounty/packages.yaml
@@ -1,5 +1,8 @@
 packages:
   # Modification of common packages
+  dev-utils-env:
+    require:
+    - +scalasca
 
   # All other packages listed alphabetically
   autoconf:
diff --git a/configs/sites/tier2/bounty/packages_oneapi-2026.0.0.yaml b/configs/sites/tier2/bounty/packages_oneapi-2026.0.0.yaml
new file mode 100644
index 000000000..978f17bc9
--- /dev/null
+++ b/configs/sites/tier2/bounty/packages_oneapi-2026.0.0.yaml
@@ -0,0 +1,41 @@
+packages:
+  all:
+    require:
+    - any_of: ['%intel-oneapi-compilers@=2026.0.0']
+      when: '%intel-oneapi-compilers'
+    - any_of: ['%gcc@=11.5.0']
+      when: '%gcc'
+  mpi:
+    buildable: False
+    require:
+    - "intel-oneapi-mpi@2021.18"
+  intel-oneapi-compilers:
+    buildable: false
+    externals:
+    - spec: intel-oneapi-compilers@2026.0.0 +fix_rt_linkage
+      prefix: /opt/intel/oneapi
+      extra_attributes:
+        compilers:
+          c: /opt/intel/oneapi/2026.0/bin/icx
+          cxx: /opt/intel/oneapi/2026.0/bin/icpx
+          fortran: /opt/intel/oneapi/2026.0/bin/ifx
+  gcc:
+    buildable: false
+    externals:
+    - spec: gcc@11.5.0 languages:='c,c++'
+      prefix: /usr
+      extra_attributes:
+        compilers:
+          c: /usr/bin/gcc
+          cxx: /usr/bin/g++
+          fortran: /usr/bin/gfortran
+  intel-oneapi-mpi:
+    buildable: false
+    externals:
+    - spec: intel-oneapi-mpi@2021.18
+      prefix: /opt/intel/oneapi
+  intel-oneapi-mkl:
+    buildable: false
+    externals:
+    - spec: intel-oneapi-mkl@2026.0
+      prefix: /opt/intel/oneapi
diff --git a/repos/builtin b/repos/builtin
index 0fb88e672..a568bb1e9 160000
--- a/repos/builtin
+++ b/repos/builtin
@@ -1 +1 @@
-Subproject commit 0fb88e672d8ed7614f89e9b050132e768e286114
+Subproject commit a568bb1e91edc58b51056d7ba645669492787c64
diff --git a/repos/spack_stack/spack_repo/spack_stack/packages/dev_utils_env/package.py b/repos/spack_stack/spack_repo/spack_stack/packages/dev_utils_env/package.py
index b9ce81a3d..2e3911b54 100644
--- a/repos/spack_stack/spack_repo/spack_stack/packages/dev_utils_env/package.py
+++ b/repos/spack_stack/spack_repo/spack_stack/packages/dev_utils_env/package.py
@@ -19,6 +19,8 @@ class DevUtilsEnv(BundlePackage):
 
     version("1.0.0")
 
+    variant("scalasca", default=False, description="Build Scalasca/Cube")
+
     depends_on("base-env", type="run")
 
     # I/O
@@ -27,6 +29,10 @@ class DevUtilsEnv(BundlePackage):
     depends_on("py-pydantic +dotenv", type="run")
     depends_on("py-pydantic-settings", type="run")
 
+    # Scalasca/ScoreP
+    depends_on("scalasca", when="+scalasca", type="run")
+    depends_on("cube +gui", when="+scalasca", type="run")
+  
     # Miscellaneous
     depends_on("cloc", type="run")
     depends_on("rank-run", type="run")
diff --git a/spack-ext/lib/jcsda-emc/spack-stack/stack/compiler_utils.py b/spack-ext/lib/jcsda-emc/spack-stack/stack/compiler_utils.py
index fcb54871c..09952983e 100644
--- a/spack-ext/lib/jcsda-emc/spack-stack/stack/compiler_utils.py
+++ b/spack-ext/lib/jcsda-emc/spack-stack/stack/compiler_utils.py
@@ -95,6 +95,7 @@ def check_preferred_compiler():
         except:
             logging.info(f"  ... {spec.name}@{spec.version}/{spec.dag_hash(length=7)} has no compiler dependency")
             continue
+        logging.warning(f"  ... {spec.name}@{spec.version}/{spec.dag_hash(length=7)}: {compiler_name}@={compiler_version}")
         # If the spec compiler matches the preferred compiler for the environment, move on.
         # Note that this permits situations where a packages has an explicit preferred (but
         # not explicitly required) compiler, but Spack decides to use the preferred (and
diff --git a/util/nrl/batch_install.sh b/util/nrl/batch_install.sh
index 73990dfaf..5b1f754b9 100755
--- a/util/nrl/batch_install.sh
+++ b/util/nrl/batch_install.sh
@@ -141,7 +141,7 @@ case ${SPACK_STACK_BATCH_HOST} in
     SPACK_STACK_CARGO_MIRROR="/neptune_diagnostics/spack-stack/cargo-mirror"
     ;;
   blueback)
-    SPACK_STACK_BATCH_COMPILERS=("oneapi@=2025.0.4" "gcc@=13.3.0" "gcc@=14.3.0") # oneapi@=2025.2.1
+    SPACK_STACK_BATCH_COMPILERS=("oneapi@=2025.0.4" "oneapi@=2026.0.0" "gcc@=13.3.0" "gcc@=14.3.0")
     SPACK_STACK_BATCH_TEMPLATES=("neptune-dev" "unified-dev" "cylc-dev")
     SPACK_STACK_MODULE_CHOICE="tcl"
     SPACK_STACK_BOOTSTRAP_MIRROR="/p/app/projects/NEPTUNE/spack-stack/bootstrap-mirror"
@@ -177,7 +177,7 @@ case ${SPACK_STACK_BATCH_HOST} in
     ;;
   bounty)
     SPACK_STACK_BATCH_COMPILERS=("oneapi@=2025.3.0" "gcc@=14.2.1" "gcc@=13.3.1" "clang@=22.1.0")
-    SPACK_STACK_BATCH_TEMPLATES=("neptune-dev" "neptune-dev-llvm" "unified-dev" "cylc-dev")
+    SPACK_STACK_BATCH_TEMPLATES=("neptune-dev") #"neptune-dev-llvm" "unified-dev" "cylc-dev")
     SPACK_STACK_MODULE_CHOICE="tcl"
     SPACK_STACK_BOOTSTRAP_MIRROR="/home/dom/prod/spack-bootstrap-mirror"
     SPACK_STACK_CARGO_MIRROR="/home/dom/prod/spack-cargo-mirror"
@@ -502,6 +502,11 @@ for compiler in "${SPACK_STACK_BATCH_COMPILERS[@]}"; do
         set +e
         module purge
         set -e
+        case ${compiler} in
+          oneapi@=2026.0.0)
+            module use /p/app/projects/NEPTUNE/spack-stack/oneapi-2026.0.0/modulefiles
+            ;;
+        esac
         ;;
       narwhal)
         umask 0022
diff --git a/util/nrl/intel_oneapi-2026.0.0_install.sh b/util/nrl/intel_oneapi-2026.0.0_install.sh
new file mode 100755
index 000000000..2aa0c9dcf
--- /dev/null
+++ b/util/nrl/intel_oneapi-2026.0.0_install.sh
@@ -0,0 +1,92 @@
+#!/usr/bin/env bash
+
+set -eu
+
+umask 0022
+module purge
+
+if [ "$#" -lt 1 ]; then
+  echo "Error: Not enough arguments. Provide Intel oneAPI installation prefix."
+  exit 1
+fi
+
+ONEAPI_INSTALL_DIR=${1}
+ONEAPI_VERSION="2026.0.0"
+COMPILER_VERSION="2026.0"
+MKL_VERSION="2026.0"
+ONEAPI_DOWNLOAD_URL=https://registrationcenter-download.intel.com/akdlm/IRC_NAS/71180075-e4e3-4c6f-bbbb-19017ed0cf7d/intel-oneapi-toolkit-2026.0.0.198_offline.sh
+
+mkdir -p ${ONEAPI_INSTALL_DIR}/src
+cd ${ONEAPI_INSTALL_DIR}/src
+wget ${ONEAPI_DOWNLOAD_URL}
+ONEAPI_INSTALL_SCRIPT="${ONEAPI_DOWNLOAD_URL##*/}"
+sh ./${ONEAPI_INSTALL_SCRIPT} -a --silent --eula accept --install-dir ${ONEAPI_INSTALL_DIR} --intel-sw-improvement-program-consent decline 2>&1 | tee log.install
+
+# Check that compiler and mkl versions are correct
+if [ ! -d "${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}" ]; then
+  echo "Error, directory ${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION} does not exist"
+  exit 1
+fi
+if [ ! -d "${ONEAPI_INSTALL_DIR}/mkl/${MKL_VERSION}" ]; then
+  echo "Error, directory ${ONEAPI_INSTALL_DIR}/mkl/${MKL_VERSION} does not exist"
+  exit 1
+fi
+
+# Create modulefiles - special modules for Cray, Intel auto-generated modules elsewhere
+HOSTNAME=$(hostname)
+if [[ "${HOSTNAME}" == *"blueback"* || "${HOSTNAME}" == *"narwhal"* ]]; then
+  mkdir -p ${ONEAPI_INSTALL_DIR}/modulefiles/intel-oneapi
+  cat << EOF > ${ONEAPI_INSTALL_DIR}/modulefiles/intel-oneapi/2026.0.0
+#%Module
+#
+# Intel oneAPI module
+#
+
+conflict intel
+conflict intel-classic
+conflict intel-oneapi
+
+set INTEL_CURPATH     ${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}
+set INTEL_LEVEL       ${COMPILER_VERSION}
+
+setenv INTEL_PATH           \$INTEL_CURPATH
+setenv INTEL_VERSION        \$INTEL_LEVEL
+setenv INTEL_COMPILER_TYPE  "ONEAPI"
+
+prepend-path {LD_LIBRARY_PATH} {${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}/opt/compiler/lib:${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}/lib}
+setenv {OCL_ICD_FILENAMES} {${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}/lib/libintelocl.so}
+setenv {CMPLR_ROOT} {${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}}
+prepend-path {CMAKE_PREFIX_PATH} {${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}}
+prepend-path {NLSPATH} {}
+prepend-path {LIBRARY_PATH} {${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}/lib}
+prepend-path {DIAGUTIL_PATH} {}
+prepend-path {MANPATH} {${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}/share/man}
+prepend-path {PATH} {${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}/bin}
+prepend-path {PKG_CONFIG_PATH} {${ONEAPI_INSTALL_DIR}/compiler/${COMPILER_VERSION}/lib/pkgconfig}
+prepend-path {LD_LIBRARY_PATH} {${ONEAPI_INSTALL_DIR}/mkl/${MKL_VERSION}/lib}
+prepend-path {CMAKE_PREFIX_PATH} {${ONEAPI_INSTALL_DIR}/mkl/${MKL_VERSION}/lib/cmake}
+prepend-path {CPATH} {${ONEAPI_INSTALL_DIR}/mkl/${MKL_VERSION}/include}
+prepend-path {LIBRARY_PATH} {${ONEAPI_INSTALL_DIR}/mkl/${MKL_VERSION}/lib}
+setenv {MKLROOT} {${ONEAPI_INSTALL_DIR}/mkl/${MKL_VERSION}}
+prepend-path {PATH} {${ONEAPI_INSTALL_DIR}/mkl/${MKL_VERSION}/bin}
+prepend-path {PKG_CONFIG_PATH} {${ONEAPI_INSTALL_DIR}/mkl/${MKL_VERSION}/lib/pkgconfig}
+
+proc ModulesHelp { } {
+    global INTEL_LEVEL
+    global INTEL_CURPATH
+}
+
+# This module was produced with dom-gen 0.0.1
+
+module-whatis   "Intel oneAPI compiler"
+EOF
+
+else
+  cd ${ONEAPI_INSTALL_DIR}
+  ./modulefiles-setup.sh --output-dir=${ONEAPI_INSTALL_DIR}/modulefiles --ignore-latest 2>&1 | tee log.modulefiles
+  # Fix non-ascii symbols in Intel modulefiles; must follow links
+  for file in `find ./modulefiles -type l`; do
+    echo $file
+    sed -i --follow-symlinks 's/®//g' $file
+  done
+fi