From c45b0cdc4b7f106e1294eb4a7359ff35ad9c300e Mon Sep 17 00:00:00 2001
From: kvrigor <kvrigor@users.noreply.github.com>
Date: Wed, 19 Nov 2025 13:17:01 +0100
Subject: [PATCH 1/9] Env files for NVHPC toolchain

---
 env/jsc.2025.nvhpc.openmpi | 57 ++++++++++++++++++++++++++++++++++++++
 env/jsc.2025.nvhpc.psmpi   | 54 ++++++++++++++++++++++++++++++++++++
 2 files changed, 111 insertions(+)
 create mode 100644 env/jsc.2025.nvhpc.openmpi
 create mode 100644 env/jsc.2025.nvhpc.psmpi

diff --git a/env/jsc.2025.nvhpc.openmpi b/env/jsc.2025.nvhpc.openmpi
new file mode 100644
index 0000000..5b3be6f
--- /dev/null
+++ b/env/jsc.2025.nvhpc.openmpi
@@ -0,0 +1,57 @@
+# --------------------------------------------------------------------------
+# Loads IntelLLVM+ParaStationMPI build environment for TSMP2.
+# This environment is tailored for JURECA [1] and JUWELS [2] supercomputers.
+#
+# [1] https://apps.fz-juelich.de/jsc/software/jureca/index.xhtml
+# [2] https://apps.fz-juelich.de/jsc/software/juwels/index.xhtml
+# 
+# Usage: source jsc.2025.intel.psmpi
+# --------------------------------------------------------------------------
+
+# Load Stages/2025
+module --force purge
+module use $OTHERSTAGES
+module load Stages/2025
+module load NVHPC/25.5-CUDA-12
+module load OpenMPI
+
+# Basic scripting and build tools
+module load Python
+module load CMake
+module load git
+
+# Storage libraries
+module load HDF5
+module load netCDF
+module load netCDF-Fortran
+module load PnetCDF
+
+# ParFlow additional libraries (TODO)
+# module load Hypre # Non-existent under NVHPC toolchain
+# module load Tcl
+if [[ "$1" == "--parflowgpu" ]]; then
+  echo "ERROR: Hypre isn't yet available on the NVHPC toolchain."
+fi
+
+# ICON additional libraries
+module load ecCodes
+
+# Set default MPI compilers
+export OMPI_CC=nvc
+export OMPI_CXX=nvc++
+export OMPI_FC=nvfortran
+export CC=mpicc
+export FC=mpif90
+export CXX=mpicxx
+export MPI_HOME=$EBROOTOPENMPI
+
+# Display compiler settings
+module list
+echo "=============== COMPILER SETTINGS  ===============" 
+echo "   Machine: ${SYSTEMNAME} on Stages/$STAGE"
+echo "   MPI lib: $(mpirun --version | head -n 1)"
+echo "         C: $($CC --version | head -n 2 | tail -n 1)"
+echo "       C++: $($CXX --version | head -n 2 | tail -n 1)"
+echo "   Fortran: $($FC --version | head -n 2 | tail -n 1)"
+echo "=================================================="
+echo ""
diff --git a/env/jsc.2025.nvhpc.psmpi b/env/jsc.2025.nvhpc.psmpi
new file mode 100644
index 0000000..7792c32
--- /dev/null
+++ b/env/jsc.2025.nvhpc.psmpi
@@ -0,0 +1,54 @@
+# --------------------------------------------------------------------------
+# Loads IntelLLVM+ParaStationMPI build environment for TSMP2.
+# This environment is tailored for JURECA [1] and JUWELS [2] supercomputers.
+#
+# [1] https://apps.fz-juelich.de/jsc/software/jureca/index.xhtml
+# [2] https://apps.fz-juelich.de/jsc/software/juwels/index.xhtml
+# 
+# Usage: source jsc.2025.intel.psmpi
+# --------------------------------------------------------------------------
+
+# Load Stages/2025
+module --force purge
+module use $OTHERSTAGES
+module load Stages/2025
+module load NVHPC/25.5-CUDA-12
+module load ParaStationMPI
+
+# Basic scripting and build tools
+module load Python
+module load CMake
+module load git
+
+# Storage libraries
+module load HDF5
+module load netCDF
+module load netCDF-Fortran
+module load PnetCDF
+
+# ParFlow additional libraries (TODO)
+# module load Hypre # Non-existent under NVHPC toolchain
+# module load Tcl
+if [[ "$1" == "--parflowgpu" ]]; then
+  echo "ERROR: Hypre isn't yet available on the NVHPC toolchain."
+fi
+
+# ICON additional libraries
+module load ecCodes
+
+# Set default MPI compilers
+export CC=mpicc
+export FC=mpif90
+export CXX=mpicxx
+export MPI_HOME=$EBROOTPSMPI
+
+# Display compiler settings
+module list
+echo "====================================== COMPILER SETTINGS ======================================"
+echo "   Machine: ${SYSTEMNAME} on Stages/$STAGE"
+echo "   MPI lib: $(mpichversion | head -n 1 | tr -d =)"
+echo "         C: $($CC --version 2>/dev/null | head -n 2 | tail -n 1)"
+echo "       C++: $($CXX --version 2>/dev/null | head -n 2 | tail -n 1)"
+echo "   Fortran: $($FC --version 2>/dev/null | head -n 2 | tail -n 1)"
+echo "==============================================================================================="
+echo ""

From 8dbeaf66f1d052dbf9ca67c53f90c1a41c1d4f52 Mon Sep 17 00:00:00 2001
From: kvrigor <kvrigor@users.noreply.github.com>
Date: Fri, 28 Nov 2025 09:37:00 +0100
Subject: [PATCH 2/9] NVHPC Hypre is now available

---
 env/jsc.2025.nvhpc.openmpi | 23 +++++++++++++++--------
 env/jsc.2025.nvhpc.psmpi   | 18 ++++++++++++------
 2 files changed, 27 insertions(+), 14 deletions(-)

diff --git a/env/jsc.2025.nvhpc.openmpi b/env/jsc.2025.nvhpc.openmpi
index 5b3be6f..6241d61 100644
--- a/env/jsc.2025.nvhpc.openmpi
+++ b/env/jsc.2025.nvhpc.openmpi
@@ -26,12 +26,19 @@ module load netCDF
 module load netCDF-Fortran
 module load PnetCDF
 
-# ParFlow additional libraries (TODO)
-# module load Hypre # Non-existent under NVHPC toolchain
-# module load Tcl
-if [[ "$1" == "--parflowgpu" ]]; then
-  echo "ERROR: Hypre isn't yet available on the NVHPC toolchain."
+# ParFlow additional libraries
+module load CUDA
+module load UCX-settings/RC-CUDA
+module load Hypre/2.31.0
+
+# TODO: Verify these values
+if [[ $SYSTEMNAME == "jedi" || $SYSTEMNAME == "jupiter" ]]; then
+  export CUDAARCHS="90"
+else
+  export CUDAARCHS="80"
 fi
+export CMAKE_CUDA_RUNTIME_LIBRARY="Shared"
+
 
 # ICON additional libraries
 module load ecCodes
@@ -47,11 +54,11 @@ export MPI_HOME=$EBROOTOPENMPI
 
 # Display compiler settings
 module list
-echo "=============== COMPILER SETTINGS  ===============" 
+echo "=========================== COMPILER SETTINGS  =======================" 
 echo "   Machine: ${SYSTEMNAME} on Stages/$STAGE"
 echo "   MPI lib: $(mpirun --version | head -n 1)"
 echo "         C: $($CC --version | head -n 2 | tail -n 1)"
 echo "       C++: $($CXX --version | head -n 2 | tail -n 1)"
 echo "   Fortran: $($FC --version | head -n 2 | tail -n 1)"
-echo "=================================================="
-echo ""
+echo "======================================================================"
+
diff --git a/env/jsc.2025.nvhpc.psmpi b/env/jsc.2025.nvhpc.psmpi
index 7792c32..fb52e49 100644
--- a/env/jsc.2025.nvhpc.psmpi
+++ b/env/jsc.2025.nvhpc.psmpi
@@ -27,11 +27,17 @@ module load netCDF-Fortran
 module load PnetCDF
 
 # ParFlow additional libraries (TODO)
-# module load Hypre # Non-existent under NVHPC toolchain
-# module load Tcl
-if [[ "$1" == "--parflowgpu" ]]; then
-  echo "ERROR: Hypre isn't yet available on the NVHPC toolchain."
+module load CUDA
+module load UCX-settings/RC-CUDA
+module load Hypre/2.31.0
+
+# TODO: Verify these values
+if [[ $SYSTEMNAME == "jedi" || $SYSTEMNAME == "jupiter" ]]; then
+  export CUDAARCHS="90"
+else
+  export CUDAARCHS="80"
 fi
+export CMAKE_CUDA_RUNTIME_LIBRARY="Shared"
 
 # ICON additional libraries
 module load ecCodes
@@ -44,11 +50,11 @@ export MPI_HOME=$EBROOTPSMPI
 
 # Display compiler settings
 module list
-echo "====================================== COMPILER SETTINGS ======================================"
+echo "========================= COMPILER SETTINGS =========================="
 echo "   Machine: ${SYSTEMNAME} on Stages/$STAGE"
 echo "   MPI lib: $(mpichversion | head -n 1 | tr -d =)"
 echo "         C: $($CC --version 2>/dev/null | head -n 2 | tail -n 1)"
 echo "       C++: $($CXX --version 2>/dev/null | head -n 2 | tail -n 1)"
 echo "   Fortran: $($FC --version 2>/dev/null | head -n 2 | tail -n 1)"
-echo "==============================================================================================="
+echo "======================================================================"
 echo ""

From fc9dbd93a104c2baef1c574c46cc8f20071d797a Mon Sep 17 00:00:00 2001
From: kvrigor <kvrigor@users.noreply.github.com>
Date: Mon, 1 Dec 2025 09:19:52 +0100
Subject: [PATCH 3/9] Added LAPACK module to intel.psmpi

---
 env/jsc.2025.intel.psmpi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/env/jsc.2025.intel.psmpi b/env/jsc.2025.intel.psmpi
index fd52f7f..16d8493 100644
--- a/env/jsc.2025.intel.psmpi
+++ b/env/jsc.2025.intel.psmpi
@@ -22,6 +22,8 @@ else
   module load Intel
 fi
 module load ParaStationMPI
+module load ScaLAPACK/2.2.0-fb
+
 
 # Basic scripting and build tools
 module load Python

From a1fa83e18c0a7516aabc37315cfce89273789cb9 Mon Sep 17 00:00:00 2001
From: kvrigor <kvrigor@users.noreply.github.com>
Date: Mon, 1 Dec 2025 10:25:19 +0100
Subject: [PATCH 4/9] Supported NVHPC on ParFlow

---
 cmake/BuildParFlow.cmake   | 8 ++++++--
 env/jsc.2025.nvhpc.openmpi | 1 +
 env/jsc.2025.nvhpc.psmpi   | 1 +
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/cmake/BuildParFlow.cmake b/cmake/BuildParFlow.cmake
index 708e14a..3071e33 100644
--- a/cmake/BuildParFlow.cmake
+++ b/cmake/BuildParFlow.cmake
@@ -35,7 +35,6 @@ else()
   else()
     set(PF_ACC_BACKEND "none") 
   endif()
-  #TODO: Add support for 'kokkos' backend
 endif()
 
 # Set compiler flags
@@ -48,7 +47,12 @@ if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
     endif()
     set(PF_FFLAGS "-ffree-line-length-none -ffixed-line-length-none")
 elseif(CMAKE_C_COMPILER_ID STREQUAL "Intel" OR CMAKE_C_COMPILER_ID STREQUAL "IntelLLVM")
-    set(PF_CFLAGS "-Wall -Werror -Wno-unused-function -Wno-unused-variable")
+elseif(CMAKE_C_COMPILER_ID STREQUAL "NVHPC")
+    if (NOT ${ParFlowGPU})
+      # TODO: Perhaps there's a case for using NVHPC to target CPU. This would require
+      #       fiddling with libraries+environment so we don't support it for now.
+      message(FATAL_ERROR "NVHPC is only valid for ParflowGPU builds.")
+    endif()
 else()
   message(FATAL_ERROR "C compiler '${CMAKE_C_COMPILER_ID}' is not supported.")
 endif()
diff --git a/env/jsc.2025.nvhpc.openmpi b/env/jsc.2025.nvhpc.openmpi
index 6241d61..cc31ee9 100644
--- a/env/jsc.2025.nvhpc.openmpi
+++ b/env/jsc.2025.nvhpc.openmpi
@@ -14,6 +14,7 @@ module use $OTHERSTAGES
 module load Stages/2025
 module load NVHPC/25.5-CUDA-12
 module load OpenMPI
+module load ScaLAPACK/2.2.0-fb
 
 # Basic scripting and build tools
 module load Python
diff --git a/env/jsc.2025.nvhpc.psmpi b/env/jsc.2025.nvhpc.psmpi
index fb52e49..36a204f 100644
--- a/env/jsc.2025.nvhpc.psmpi
+++ b/env/jsc.2025.nvhpc.psmpi
@@ -14,6 +14,7 @@ module use $OTHERSTAGES
 module load Stages/2025
 module load NVHPC/25.5-CUDA-12
 module load ParaStationMPI
+module load ScaLAPACK/2.2.0-fb
 
 # Basic scripting and build tools
 module load Python

From 41fc97ff12726ae51914d899e3ad7387124bd84c Mon Sep 17 00:00:00 2001
From: kvrigor <kvrigor@users.noreply.github.com>
Date: Mon, 1 Dec 2025 10:26:45 +0100
Subject: [PATCH 5/9] Switched eCLM to dev-nvhpc-support branch

---
 .gitmodules | 2 +-
 models/eCLM | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.gitmodules b/.gitmodules
index 2a7a07c..c705552 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -17,7 +17,7 @@
 [submodule "models/eCLM"]
 	path = models/eCLM
 	url = https://github.com/HPSCTerrSys/eCLM.git
-	branch = beta-0.4
+	branch = dev-nvhpc-support
 [submodule "models/oasis3-mct"]
         path = models/oasis3-mct
         url = https://icg4geo.icg.kfa-juelich.de/ExternalReposPublic/oasis3-mct
diff --git a/models/eCLM b/models/eCLM
index 4d567d2..78bb748 160000
--- a/models/eCLM
+++ b/models/eCLM
@@ -1 +1 @@
-Subproject commit 4d567d2d68cac0fba977914b4a9c3ba199afd0ff
+Subproject commit 78bb7482d8ee6ba0e819ec3f0f0d91886a94caaf

From 058e95651b12c577c2f2a86f7bc2c83f92c01653 Mon Sep 17 00:00:00 2001
From: kvrigor <kvrigor@users.noreply.github.com>
Date: Mon, 1 Dec 2025 14:00:21 +0100
Subject: [PATCH 6/9] Supported nvfortran build on OASIS3-MCT library

A notable issue is the lack of quad-precision (16 bytes) support
in NVHPC ([1]). Luckily OASIS has a  __NO_16BYTE_REALS compiler
definition to work around this issue.

[1]: https://forums.developer.nvidia.com/t/need-support-for-real-16-on-cpu-in-the-nvfortran-compiler/316805
---
 cmake/BuildOASIS3MCT.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cmake/BuildOASIS3MCT.cmake b/cmake/BuildOASIS3MCT.cmake
index c66840f..2fcb736 100644
--- a/cmake/BuildOASIS3MCT.cmake
+++ b/cmake/BuildOASIS3MCT.cmake
@@ -44,6 +44,9 @@ if(CMAKE_Fortran_COMPILER_ID STREQUAL "GNU")
   file(APPEND  ${OASIS_MAKE_INC} "FCBASEFLAGS     = ${OPTIM} -I. -ffree-line-length-none -fallow-argument-mismatch ${OpenMP_Fortran_FLAGS}\n")
 elseif(CMAKE_Fortran_COMPILER_ID STREQUAL "Intel" OR CMAKE_Fortran_COMPILER_ID STREQUAL "IntelLLVM")
   file(APPEND  ${OASIS_MAKE_INC} "FCBASEFLAGS     = ${OPTIM} -I. -xCORE-AVX2 -assume byterecl -mt_mpi ${OpenMP_Fortran_FLAGS}\n")
+elseif(CMAKE_Fortran_COMPILER_ID STREQUAL "NVHPC")
+  # nvfortran doesn't support real(16) / quad precision; hence the __NO_16BYTE_REALS here.
+  file(APPEND  ${OASIS_MAKE_INC} "FCBASEFLAGS     = -D__NO_16BYTE_REALS ${OPTIM} -I. ${OpenMP_Fortran_FLAGS}\n")
 else()
   message(FATAL_ERROR "Fortran compiler '${CMAKE_Fortran_COMPILER_ID}' is not supported.")
 endif()
@@ -68,7 +71,7 @@ ExternalProject_Add(OASIS3_MCT
   SOURCE_DIR        ${OASIS_SRC}
   BUILD_IN_SOURCE   FALSE
   CONFIGURE_COMMAND ""
-  BUILD_COMMAND     make -f ${OASIS_SRC}/util/make_dir/TopMakefileOasis3 static-libs -C ${OASIS_BLD_DIR}
+  BUILD_COMMAND     make -f ${OASIS_SRC}/util/make_dir/TopMakefileOasis3 realclean static-libs -C ${OASIS_BLD_DIR}
   INSTALL_COMMAND   ""
 )
 

From 6956195bd59d13bd8a69db71e2382672f53b657f Mon Sep 17 00:00:00 2001
From: kvrigor <kvrigor@users.noreply.github.com>
Date: Mon, 1 Dec 2025 14:39:42 +0100
Subject: [PATCH 7/9] Updated eCLM tip

---
 models/eCLM | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/models/eCLM b/models/eCLM
index 78bb748..701d501 160000
--- a/models/eCLM
+++ b/models/eCLM
@@ -1 +1 @@
-Subproject commit 78bb7482d8ee6ba0e819ec3f0f0d91886a94caaf
+Subproject commit 701d50170c6f23085c9d4bd68a8e752869d986c5

From 17928f5fdbc06658fe67ba08dc7a0337e4a097e2 Mon Sep 17 00:00:00 2001
From: kvrigor <kvrigor@users.noreply.github.com>
Date: Wed, 10 Dec 2025 11:44:24 +0100
Subject: [PATCH 8/9] Updated eCLM

---
 models/eCLM | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/models/eCLM b/models/eCLM
index 701d501..548116b 160000
--- a/models/eCLM
+++ b/models/eCLM
@@ -1 +1 @@
-Subproject commit 701d50170c6f23085c9d4bd68a8e752869d986c5
+Subproject commit 548116ba71942636ffad8f6460b8d48f8b16670d

From d338182174aa208b96282701289ffac79053762b Mon Sep 17 00:00:00 2001
From: Johannes Keller <16795031+jjokella@users.noreply.github.com>
Date: Thu, 11 Dec 2025 12:57:47 +0100
Subject: [PATCH 9/9] Support NVHPC toolchain for PDAF (#116)

* BuildPDAF: Support NVHPC toolchain for PDAF

* Also: Updating to newer version of PDAF (relies on HPSCTerrSys/pdaf#40)
---
 cmake/BuildPDAF.cmake | 44 +++++++++++++++++++++++++++++++++++++++++++
 models/pdaf           |  2 +-
 2 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/cmake/BuildPDAF.cmake b/cmake/BuildPDAF.cmake
index 50dc58a..499f1d1 100644
--- a/cmake/BuildPDAF.cmake
+++ b/cmake/BuildPDAF.cmake
@@ -24,6 +24,7 @@ endif()
 # LAPACK is required
 # For eCLM-PDAF, this setting has to be consistent with MKL/LAPACK
 # loading in `eCLM/src/clm5/CMakelists.txt`
+# https://cmake.org/cmake/help/latest/module/FindLAPACK.html
 find_package(LAPACK REQUIRED)
 
 # OpenMP is required
@@ -73,6 +74,12 @@ elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
   list(APPEND PDAF_LINK_LIBS "-mkl")
   list(APPEND PDAF_LINK_LIBS "${LAPACK_LIBRARIES}")
   message(WARNING "LAPACK_LIBRARIES: ${LAPACK_LIBRARIES}")
+elseif (CMAKE_CXX_COMPILER_ID STREQUAL "NVHPC")
+  # MKL command
+  list(APPEND PDAF_LINK_LIBS "${LAPACK_LIBRARIES}")
+  list(APPEND PDAF_LINK_LIBS "${LAPACK_LINKER_FLAGS}")
+  message(STATUS "LAPACK_LIBRARIES: ${LAPACK_LIBRARIES}")
+  message(STATUS "LAPACK_LINKER_FLAGS: ${LAPACK_LINKER_FLAGS}")
 else()
   message(FATAL_ERROR "Unsupported CMAKE_CXX_COMPILER_ID: ${CMAKE_CXX_COMPILER_ID}")
 endif()
@@ -147,6 +154,22 @@ elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
   list(APPEND PDAF_FOPT "-fallow-argument-mismatch")
   list(APPEND PDAF_FOPT "-fcommon")
 
+elseif (CMAKE_CXX_COMPILER_ID STREQUAL "NVHPC")
+
+  # Using NVHPC
+  if (CMAKE_BUILD_TYPE STREQUAL "RELEASE")
+    # Release optimization flags
+    list(APPEND PDAF_FOPT "-Ofast")
+  elseif (CMAKE_BUILD_TYPE STREQUAL "DEBUG")
+    # Debug optimization flags
+    list(APPEND PDAF_FOPT "-O0")
+    list(APPEND PDAF_FOPT "-g")
+  else()
+    message(FATAL_ERROR "Unsupported CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+  endif()
+
+  list(APPEND PDAF_FOPT "-fPIC")
+
 else()
   message(FATAL_ERROR "Unsupported CMAKE_CXX_COMPILER_ID: ${CMAKE_CXX_COMPILER_ID}")
 endif()
@@ -195,6 +218,22 @@ elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
   list(APPEND PDAF_COPT "-mcmodel=large")
   list(APPEND PDAF_COPT "-fcommon")
 
+elseif (CMAKE_CXX_COMPILER_ID STREQUAL "NVHPC")
+
+  # Using NVHPC
+  if (CMAKE_BUILD_TYPE STREQUAL "RELEASE")
+    # Release optimization flags
+    list(APPEND PDAF_COPT "-Ofast")
+  elseif (CMAKE_BUILD_TYPE STREQUAL "DEBUG")
+    # Debug optimization flags
+    list(APPEND PDAF_COPT "-O0")
+    list(APPEND PDAF_COPT "-g")
+  else()
+    message(FATAL_ERROR "Unsupported CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+  endif()
+
+  list(APPEND PDAF_COPT "-fPIC")
+
 else()
   message(FATAL_ERROR "Unsupported CMAKE_CXX_COMPILER_ID: ${CMAKE_CXX_COMPILER_ID}")
 endif()
@@ -213,6 +252,11 @@ elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
 
   list(APPEND PDAF_DOUBLEPRECISION "-fdefault-real-8")
 
+elseif (CMAKE_CXX_COMPILER_ID STREQUAL "NVHPC")
+
+  # doubleprecision flag!?
+  list(APPEND PDAF_DOUBLEPRECISION "-r8")
+
 else()
   message(FATAL_ERROR "Unsupported CMAKE_CXX_COMPILER_ID: ${CMAKE_CXX_COMPILER_ID}")
 endif()
diff --git a/models/pdaf b/models/pdaf
index 8f8cc5c..3c9cef3 160000
--- a/models/pdaf
+++ b/models/pdaf
@@ -1 +1 @@
-Subproject commit 8f8cc5cb7502abdb4fd89f91807a177c9f0cb8b9
+Subproject commit 3c9cef36c088787f541f354ee39d63f4dac6e9dc