diff --git a/.azure-pipelines/azure-pipelines-osx.yml b/.azure-pipelines/azure-pipelines-osx.yml
index f1712cd..a6548f9 100755
--- a/.azure-pipelines/azure-pipelines-osx.yml
+++ b/.azure-pipelines/azure-pipelines-osx.yml
@@ -5,7 +5,7 @@
 jobs:
 - job: osx
   pool:
-    vmImage: macOS-12
+    vmImage: macOS-13
   strategy:
     matrix:
       osx_64_mpimpich:
diff --git a/.ci_support/win_64_mpiimpi.yaml b/.ci_support/win_64_mpiimpi.yaml
index 2e1fd04..89aedb9 100644
--- a/.ci_support/win_64_mpiimpi.yaml
+++ b/.ci_support/win_64_mpiimpi.yaml
@@ -3,11 +3,15 @@ c_compiler:
 c_stdlib:
 - vs
 channel_sources:
-- conda-forge
+- conda-forge/label/llvm_rc,conda-forge
 channel_targets:
 - conda-forge main
 cxx_compiler:
 - vs2019
+fortran_compiler:
+- flang
+fortran_compiler_version:
+- '19'
 hdf5:
 - 1.14.3
 libaec:
diff --git a/.ci_support/win_64_mpinompi.yaml b/.ci_support/win_64_mpinompi.yaml
index 9c0136f..d3bd9ec 100644
--- a/.ci_support/win_64_mpinompi.yaml
+++ b/.ci_support/win_64_mpinompi.yaml
@@ -3,11 +3,15 @@ c_compiler:
 c_stdlib:
 - vs
 channel_sources:
-- conda-forge
+- conda-forge/label/llvm_rc,conda-forge
 channel_targets:
 - conda-forge main
 cxx_compiler:
 - vs2019
+fortran_compiler:
+- flang
+fortran_compiler_version:
+- '19'
 hdf5:
 - 1.14.3
 libaec:
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index e5306da..32da3d0 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -2,7 +2,32 @@
 # update the conda-forge.yml and/or the recipe/meta.yaml.
 # -*- mode: yaml -*-
 
-jobs:
-  - template: ./.azure-pipelines/azure-pipelines-linux.yml
-  - template: ./.azure-pipelines/azure-pipelines-osx.yml
-  - template: ./.azure-pipelines/azure-pipelines-win.yml
\ No newline at end of file
+stages:
+- stage: Check
+  jobs:
+    - job: Skip
+      pool:
+        vmImage: 'ubuntu-22.04'
+      variables:
+        DECODE_PERCENTS: 'false'
+        RET: 'true'
+      steps:
+      - checkout: self
+        fetchDepth: '2'
+      - bash: |
+          git_log=`git log --max-count=1 --skip=1 --pretty=format:"%B" | tr "\n" " "`
+          echo "##vso[task.setvariable variable=log]$git_log"
+        displayName: Obtain commit message
+      - bash: echo "##vso[task.setvariable variable=RET]false"
+        condition: or(contains(variables.log, '[skip azp]'), contains(variables.log, '[azp skip]'), contains(variables.log, '[skip ci]'), contains(variables.log, '[ci skip]'))
+        displayName: Skip build?
+      - bash: echo "##vso[task.setvariable variable=start_main;isOutput=true]$RET"
+        name: result
+        displayName: Export result
+- stage: Build
+  condition: and(succeeded(), eq(dependencies.Check.outputs['Skip.result.start_main'], 'true'))
+  dependsOn: Check
+  jobs:
+    - template: ./.azure-pipelines/azure-pipelines-linux.yml
+    - template: ./.azure-pipelines/azure-pipelines-osx.yml
+    - template: ./.azure-pipelines/azure-pipelines-win.yml
\ No newline at end of file
diff --git a/recipe/bld-flang.bat b/recipe/bld-flang.bat
new file mode 100644
index 0000000..9bfc668
--- /dev/null
+++ b/recipe/bld-flang.bat
@@ -0,0 +1,88 @@
+@echo on
+setlocal EnableDelayedExpansion
+
+mkdir build
+cd build
+
+REM set clanglibdir=%CONDA_PREFIX:\=/%/lib/clang/19/lib/windows
+REM copy "%clanglibdir%\clang_rt.builtins-x86_64.lib" "%LIBRARY_LIB%\clang_rt.builtins.lib"
+
+:: Set environment variables.
+set HDF5_EXT_ZLIB=zlib.lib
+
+:: temporarily vendor flang compiler activation
+set "FC=flang-new"
+set "CC=clang-cl"
+set "CXX=clang-cl"
+
+:: need to read clang version for path to compiler-rt
+FOR /F "tokens=* USEBACKQ" %%F IN (`clang.exe -dumpversion`) DO (
+    SET "CLANG_VER=%%F"
+)
+set "FFLAGS=-D_CRT_SECURE_NO_WARNINGS -D_MT -D_DLL --target=x86_64-pc-windows-msvc"
+set "LDFLAGS=--target=x86_64-pc-windows-msvc -fms-runtime-lib=dll -fuse-ld=lld"
+set "LDFLAGS=%LDFLAGS% -Wl,-defaultlib:%BUILD_PREFIX%/Library/lib/clang/!CLANG_VER:~0,2!/lib/windows/clang_rt.builtins-x86_64.lib"
+
+
+set "CXXFLAGS=%CXXFLAGS% -LTCG"
+if "%mpi%"=="impi" (
+  :: cmake generates syntax errors if there are backslashes in paths
+  set _LIBRARY=%LIBRARY_PREFIX:\=/%
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_C_ADDITIONAL_INCLUDE_DIRS:PATH=!_LIBRARY!/include"
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_CXX_ADDITIONAL_INCLUDE_DIRS:PATH=!_LIBRARY!/include"
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_C_LIB_NAMES=IMPI"
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_CXX_LIB_NAMES=IMPI"
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_IMPI_LIBRARY:PATH=!_LIBRARY!/lib/impi.lib"
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_ASSUME_NO_BUILTIN_MPI=ON"
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_SKIP_COMPILER_WRAPPER=ON"
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_SKIP_GUESSING=ON"
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D HDF5_ENABLE_PARALLEL:BOOL=ON"
+)
+
+echo "CMAKE_ARGS=!CMAKE_ARGS!"
+
+:: Configure step.
+cmake -G "Ninja" ^
+      !CMAKE_ARGS! ^
+      -D CMAKE_BUILD_TYPE:STRING=RELEASE ^
+      -D CMAKE_PREFIX_PATH:PATH=%LIBRARY_PREFIX% ^
+      -D CMAKE_INSTALL_PREFIX:PATH=%LIBRARY_PREFIX% ^
+      -D CMAKE_Fortran_COMPILER:STRING=%FC% ^
+      -D HDF5_BUILD_CPP_LIB:BOOL=ON ^
+      -D CMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON ^
+      -D BUILD_SHARED_LIBS:BOOL=ON ^
+      -D BUILD_STATIC_LIBS:BOOL=OFF ^
+      -D ONLY_SHARED_LIBS:BOOL=ON ^
+      -D HDF5_BUILD_HL_LIB:BOOL=ON ^
+      -D HDF5_BUILD_TOOLS:BOOL=ON ^
+      -D HDF5_BUILD_FORTRAN:BOOL=ON ^
+      -D HDF5_BUILD_HL_GIF_TOOLS:BOOL=ON ^
+      -D HDF5_ENABLE_Z_LIB_SUPPORT:BOOL=ON ^
+      -D HDF5_ENABLE_THREADSAFE:BOOL=ON ^
+      -D HDF5_ENABLE_ROS3_VFD:BOOL=ON ^
+      -D HDF5_ENABLE_SZIP_SUPPORT=ON ^
+      -D ALLOW_UNSUPPORTED:BOOL=ON ^
+      %SRC_DIR%
+
+if errorlevel 1 (
+  dir CMakeFiles
+  type CMakeFiles\CMakeOutput.log
+  type CMakeFiles\CMakeError.log
+  type CMakeFiles\CMakeConfigureLog.yaml
+  exit /b 1
+)
+
+:: Build C libraries and tools.
+ninja
+if errorlevel 1 exit 1
+
+:: Install step.
+ninja install
+if errorlevel 1 exit 1
+
+:: Remove extraneous COPYING file that gets installed automatically
+:: https://github.com/conda-forge/hdf5-feedstock/issues/87
+del /f %PREFIX%\Library\COPYING
+if errorlevel 1 exit 1
+del /f %PREFIX%\Library\RELEASE.txt
+if errorlevel 1 exit 1
diff --git a/recipe/conda_build_config.yaml b/recipe/conda_build_config.yaml
index d236281..dae9a00 100644
--- a/recipe/conda_build_config.yaml
+++ b/recipe/conda_build_config.yaml
@@ -2,4 +2,12 @@ mpi:
   - nompi
   - impi  # [win]
   - mpich  # [unix]
-  - openmpi  # [unix]
\ No newline at end of file
+  - openmpi  # [unix]
+
+channel_sources:
+- conda-forge/label/llvm_rc,conda-forge   # [win]
+
+fortran_compiler:          # [win]
+- flang                    # [win]
+fortran_compiler_version:  # [win]
+- '19'                     # [win]
\ No newline at end of file
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index f06ed2c..c16c918 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -53,10 +53,12 @@ source:
     - patches/0002-run-host-H5detect-when-cross-compiling.patch     # [osx and build_platform != target_platform]
     # Fix operator= (https://github.com/HDFGroup/hdf5/pull/4473)
     - patches/ea760136.patch
+    - patches/fix_flang_flags.patch  # [win]
 
 build:
   number: {{ build }}
   string: {{ mpi_prefix }}_h{{ PKG_HASH }}_{{ build }}
+  script: '{{ RECIPE_DIR}}/bld-flang.bat'  # [win]
   run_exports:
     - {{ pin_subpackage('hdf5', max_pin='x.x.x') }} {{ build_pin }}
 
@@ -67,7 +69,7 @@ requirements:
     - {{ compiler('c') }}
     - {{ stdlib('c') }}
     - {{ compiler('cxx') }}
-    - {{ compiler('fortran') }}  # [not win]
+    - {{ compiler('fortran') }}
     - cmake                      # [win]
     - automake                   # [not win]
     - autoconf                   # [not win]
diff --git a/recipe/patches/fix_flang_flags.patch b/recipe/patches/fix_flang_flags.patch
new file mode 100644
index 0000000..d03e1e3
--- /dev/null
+++ b/recipe/patches/fix_flang_flags.patch
@@ -0,0 +1,25 @@
+Subject: [PATCH] fix flang flags
+---
+Index: config/cmake/ConfigureChecks.cmake
+IDEA additional info:
+Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
+<+>UTF-8
+===================================================================
+diff --git a/config/cmake/ConfigureChecks.cmake b/config/cmake/ConfigureChecks.cmake
+--- a/config/cmake/ConfigureChecks.cmake	(revision 4041d6f34ffa4630cfb60ce1f42b6cb9ab715a6b)
++++ b/config/cmake/ConfigureChecks.cmake	(date 1713426546921)
+@@ -61,7 +61,13 @@
+ if (WIN32 AND NOT MINGW)
+   if (NOT UNIX)
+     set (WINDOWS 1)
+-    set (CMAKE_REQUIRED_FLAGS "/DWIN32_LEAN_AND_MEAN=1 /DNOGDI=1")
++    # IF CMAKE_Fortran_COMPILER contains
++    if (CMAKE_Fortran_COMPILER MATCHES "flang")
++      message(STATUS "Using flang-new compiler")
++      set (CMAKE_REQUIRED_FLAGS "-DWIN32_LEAN_AND_MEAN=1 -DNOGDI=1")
++    else ()
++      set (CMAKE_REQUIRED_FLAGS "/DWIN32_LEAN_AND_MEAN=1 /DNOGDI=1")
++    endif ()
+     if (MSVC)
+       set (${HDF_PREFIX}_HAVE_VISUAL_STUDIO 1)
+     endif ()