Python 3.14 Openexr fails to install

[avery-gump]

running pip install . from visionsim directory fails when trying to install openexr dependency on python 3.14. Successfully installs on python 3.13

[jungerm2]

Well, what error are you getting? What OS/platform is this for?

This might be worth reporting directly to the AcademySoftwareFoundation instead...

[jungerm2]

I ran into this myself, and it seems that for my platform at least, OpenEXR isn't distributed as a wheel for Python 3.14 and instead needs to be compiled when pip installing.

Here's th error I was getting:

Resolved 2 packages in 675ms
  × Failed to build `openexr==3.4.6`
  ├─▶ The build backend returned an error
  ╰─▶ Call to `scikit_build_core.build.build_wheel` failed (exit status: 1)

      [stdout]
      openexr_skbuild_plugin: Computing OpenEXR version from CMake...
      openexr_skbuild_plugin: Computed version: 3.4.6
      *** scikit-build-core 0.11.6 using CMake 4.2.3 (wheel)
      *** Configuring CMake...
      loading initial cache file /tmp/tmpswhhwl1p/build/CMakeInit.txt
      -- The C compiler identification is GNU 15.2.1
      -- The CXX compiler identification is GNU 15.2.1
      -- Detecting C compiler ABI info
      -- Detecting C compiler ABI info - done
      -- Check for working C compiler: /usr/bin/gcc - skipped
      -- Detecting C compile features
      -- Detecting C compile features - done
      -- Detecting CXX compiler ABI info
      -- Detecting CXX compiler ABI info - done
      -- Check for working CXX compiler: /usr/bin/g++ - skipped
      -- Detecting CXX compile features
      -- Detecting CXX compile features - done
      -- Building against C++ Standard: 17
      -- Performing Test CMAKE_HAVE_LIBC_PTHREAD
      -- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
      -- Found Threads: TRUE
      -- libdeflate forced internal, using vendored code
      -- openjph forced internal, using vendored code, version ..
      -- Imath forced internal, fetching from https://github.com/AcademySoftwareFoundation/Imath.git @ v3.2.2
      -- Imath is configuring as a cmake sub project
      -- Configure Imath 3.2.2, library API version: 30.3.2.2
      -- Imath pkg-config generation enabled
      -- Looking for sin in m
      -- Looking for sin in m - found
      -- Performing Test OPENEXR_IMF_HAVE_SYSCONF_NPROCESSORS_ONLN
      -- Performing Test OPENEXR_IMF_HAVE_SYSCONF_NPROCESSORS_ONLN - Success
      -- Performing Test OPENEXR_IMF_HAVE_GCC_INLINE_ASM_AVX
      -- Performing Test OPENEXR_IMF_HAVE_GCC_INLINE_ASM_AVX - Success
      -- Looking for include file ucontext.h
      -- Looking for include file ucontext.h - found
      -- Performing Test IEX_HAVE_CONTROL_REGISTER_SUPPORT
      -- Performing Test IEX_HAVE_CONTROL_REGISTER_SUPPORT - Success
      -- Looking for include file semaphore.h
      -- Looking for include file semaphore.h - found
      -- OpenEXR pkg-config generation disabled
      -- Configure OpenEXR 3.4.6, library API version: 33.3.4.6
      -- Building OpenEXR libraries
      -- OpenJPH library version: 0.26.3
      -- CPU Architecture is OJPH_ARCH_X86_64
      -- Building Release
      -- C Standard is set to 11
      -- C++ Standard is set to 14
      -- Looking for aligned_alloc
      -- Looking for aligned_alloc - found
      -- clang-format not found.
      -- Building OpenEXR python bindings
      -- Configuring incomplete, errors occurred!

      [stderr]
      WARNING: Minimum CMake version set as 'CMakeLists.txt' is less than 3.15. This is not supported by scikit-build-core; set manually or increase to avoid this warning.
      WARNING: Use build.targets instead of cmake.targets for scikit-build-core >= 0.10
      CMake Error at /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython/Support.cmake:804 (file):
        file STRINGS file "/usr/include/python3.14/patchlevel.h" cannot be read.
      Call Stack (most recent call first):
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython/Support.cmake:3832 (_python_get_version)
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython3.cmake:671 (include)
        src/wrappers/python/CMakeLists.txt:12 (find_package)


      CMake Error at /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython/Support.cmake:809 (list):
        list GET given empty list
      Call Stack (most recent call first):
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython/Support.cmake:3832 (_python_get_version)
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython3.cmake:671 (include)
        src/wrappers/python/CMakeLists.txt:12 (find_package)


      CMake Error at /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython/Support.cmake:810 (list):
        list GET given empty list
      Call Stack (most recent call first):
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython/Support.cmake:3832 (_python_get_version)
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython3.cmake:671 (include)
        src/wrappers/python/CMakeLists.txt:12 (find_package)


      CMake Error at /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython/Support.cmake:811 (list):
        list GET given empty list
      Call Stack (most recent call first):
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython/Support.cmake:3832 (_python_get_version)
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython3.cmake:671 (include)
        src/wrappers/python/CMakeLists.txt:12 (find_package)


      CMake Error at /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPackageHandleStandardArgs.cmake:290 (message):
        Could NOT find Python3 (missing: Development.Module) (found version
        "3.14.3")
      Call Stack (most recent call first):
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPackageHandleStandardArgs.cmake:654 (_FPHSA_FAILURE_MESSAGE)
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython/Support.cmake:4190 (find_package_handle_standard_args)
        /home/sjung/.cache/uv/builds-v0/.tmpT7KjcK/lib/python3.14/site-packages/cmake/data/share/cmake-4.2/Modules/FindPython3.cmake:671 (include)
        src/wrappers/python/CMakeLists.txt:12 (find_package)



      *** CMake configuration failed

      hint: This usually indicates a problem with the package or the build environment.

Which was resolved by ensuring the python developer dependencies where installed. On fedora you can just sudo dnf install python3-devel and then you can pip install OpenEXR. I think the package on Ubuntu is simply python3-dev. Try this?

[avery-gump]

This is the error I get

Error Log

Click to expand pip install error

error: subprocess-exited-with-error

× Preparing metadata (pyproject.toml) did not run successfully.
│ exit code: 1
╰─> [81 lines of output]
    WARNING: Minimum CMake version set as 'CMakeLists.txt' is less than 3.15. This is not supported by scikit-build-core; set manually or increase to avoid this warning.
    WARNING: Use build.targets instead of cmake.targets for scikit-build-core >= 0.10
    openexr_skbuild_plugin: Computing OpenEXR version from CMake...
    -- Building for: NMake Makefiles
    CMake Error at CMakeLists.txt:30 (project):
      Running
    
        'nmake' '-?'
    
      failed with:
    
        no such file or directory
    
    
    CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
    CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
    -- Configuring incomplete, errors occurred!
    
    Traceback (most recent call last):
      File "C:\Users\avery\AppData\Local\Temp\pip-install-oy1q6jri\openexr_cfb2c1b3a3364881affbf3353575955c\src/wrappers/python\openexr_skbuild_plugin.py", line 61, in dynamic_metadata      
        subprocess.run(
        ~~~~~~~~~~~~~~^
            [
            ^
        ...<10 lines>...
            text=True,
            ^^^^^^^^^^
        )
        ^
      File "C:\Users\avery\AppData\Local\Python\pythoncore-3.14-64\Lib\subprocess.py", line 577, in run
        raise CalledProcessError(retcode, process.args,
                                 output=stdout, stderr=stderr)
    subprocess.CalledProcessError: Command '['cmake', '-S', 'C:\\Users\\avery\\AppData\\Local\\Temp\\pip-install-oy1q6jri\\openexr_cfb2c1b3a3364881affbf3353575955c\\src/wrappers/python../../../..', '-B', 'C:\\Users\\avery\\AppData\\Local\\Temp\\tmpzr33jxby', '-DOPENEXR_BUILD_LIBS=OFF']' returned non-zero exit status 1.
    
    The above exception was the direct cause of the following exception:
    
    Traceback (most recent call last):
      File "C:\Users\avery\OneDrive\Documents\repos\visionsim\.venvTEST\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 389, in <module>
        main()
        ~~~~^^
      File "C:\Users\avery\OneDrive\Documents\repos\visionsim\.venvTEST\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 373, in main
        json_out["return_val"] = hook(**hook_input["kwargs"])
                                 ~~~~^^^^^^^^^^^^^^^^^^^^^^^^
      File "C:\Users\avery\OneDrive\Documents\repos\visionsim\.venvTEST\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 175, in prepare_metadata_for_build_wheel
        return hook(metadata_directory, config_settings)
      File "C:\Users\avery\AppData\Local\Temp\pip-build-env-yd4j7a9a\overlay\Lib\site-packages\scikit_build_core\build\__init__.py", line 96, in prepare_metadata_for_build_wheel
        return _build_wheel_impl(
               ~~~~~~~~~~~~~~~~~^
            None, config_settings, metadata_directory, editable=False
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        ).wheel_filename  # actually returns the dist-info directory
        ^
      File "C:\Users\avery\AppData\Local\Temp\pip-build-env-yd4j7a9a\overlay\Lib\site-packages\scikit_build_core\build\wheel.py", line 176, in _build_wheel_impl
        return _build_wheel_impl_impl(
            wheel_directory,
        ...<5 lines>...
            pyproject=pyproject,
        )
      File "C:\Users\avery\AppData\Local\Temp\pip-build-env-yd4j7a9a\overlay\Lib\site-packages\scikit_build_core\build\wheel.py", line 233, in _build_wheel_impl_impl
        metadata = get_standard_metadata(pyproject, settings)
      File "C:\Users\avery\AppData\Local\Temp\pip-build-env-yd4j7a9a\overlay\Lib\site-packages\scikit_build_core\build\metadata.py", line 44, in get_standard_metadata
        new_pyproject_dict["project"] = process_dynamic_metadata(
                                        ~~~~~~~~~~~~~~~~~~~~~~~~^
            new_pyproject_dict["project"], settings.metadata
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        )
        ^
      File "C:\Users\avery\AppData\Local\Temp\pip-build-env-yd4j7a9a\overlay\Lib\site-packages\scikit_build_core\builder\_load_provider.py", line 150, in process_dynamic_metadata
        return dict(settings)
      File "C:\Users\avery\AppData\Local\Temp\pip-build-env-yd4j7a9a\overlay\Lib\site-packages\scikit_build_core\builder\_load_provider.py", line 114, in __getitem__
        self.project[key] = provider.dynamic_metadata(  # type: ignore[call-arg]
                            ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
            ^^^^^^^^^^^^^^^^^^^^^^^
        )
        ^
      File "C:\Users\avery\AppData\Local\Temp\pip-install-oy1q6jri\openexr_cfb2c1b3a3364881affbf3353575955c\src/wrappers/python\openexr_skbuild_plugin.py", line 77, in dynamic_metadata      
        raise RuntimeError(
            "Failed to configure project to get the version"
        ) from exc
    RuntimeError: Failed to configure project to get the version
    [end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.