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function(FIND_OPENIMAGEIO_EXT)

    # Explicit code since a version range on find_package() does not support multiple major
    # versions.
    find_package(OpenImageIO)
    if(OpenImageIO_FOUND)
        if(${OpenImageIO_VERSION} VERSION_LESS "2.4")
            set(OpenImageIO_FOUND OFF)
            message(WARNING "Found OpenImageIO version ${OpenImageIO_VERSION} is too old.")
        elseif(${OpenImageIO_VERSION} VERSION_GREATER_EQUAL "4.0")
            set(OpenImageIO_FOUND OFF)
            message(WARNING "Found OpenImageIO version ${OpenImageIO_VERSION} is too new.")
        endif()
    endif()

    # See https://github.com/microsoft/vcpkg/issues/29284
    find_package(OpenEXR)

    # Misuse OpenImageIO version to distinguish older vcpkg versions (e.g. 42f74e3db
    # plus patch) from newer vcpkg versions (e.g. 3640e7cb1).
    if(OpenImageIO_FOUND)
        if(${OpenImageIO_VERSION} VERSION_LESS "2.4.5.0")
            # Needed by OpenImageIO::OpenImageIO target in older vcpkg versions
            find_package(TIFF)
            find_package(liblzma CONFIG)
        endif()
    endif()

    if(NOT OpenImageIO_FOUND OR NOT OpenEXR_FOUND)

        message(STATUS "OpenImageIO_FOUND: ${OpenImageIO_FOUND}")
        message(STATUS "OpenImageIO_DIR: ${OpenImageIO_DIR}")
        message(STATUS "OpenImageIO_INCLUDE_DIR: ${OpenImageIO_INCLUDE_DIR}")
        message(STATUS "OpenImageIO_LIB_DIR: ${OpenImageIO_LIB_DIR}")
        message(STATUS "OpenEXR_FOUND: ${OpenEXR_FOUND}")
        message(WARNING "The dependency \"OpenImageIO\" could not be resolved. Please specify "
            "'CMAKE_TOOLCHAIN_FILE'.")
        set(MDL_OPENIMAGEIO_FOUND OFF CACHE INTERNAL "")

    else()

        # Used by some unit tests via the USES_IDIFF option.
        find_program(
            OpenImageIO_IDIFF
            NAMES
                idiff
            PATHS
                ${OpenImageIO_INCLUDE_DIR}/../tools/openimageio
                ${OpenImageIO_INCLUDE_DIR}/../bin
            )
        if(NOT OpenImageIO_IDIFF)
            message(WARNING "The idiff tool from \"OpenImageIO\" could not be found. Please specify "
                "'CMAKE_TOOLCHAIN_FILE'. Alternatively, you can disable the option 'MDL_ENABLE_UNIT_TESTS'.")
        endif()

        # store paths that are later used in the add_openimageio.cmake
        set(MDL_DEPENDENCY_OPENIMAGEIO_INCLUDE ${OpenImageIO_INCLUDE_DIR} CACHE INTERNAL
            "OpenImageIO header directory")
        set(MDL_DEPENDENCY_OPENIMAGEIO_LIB ${OpenImageIO_LIB_DIR} CACHE INTERNAL
            "OpenImageIO library directory")
        set(MDL_DEPENDENCY_OPENIMAGEIO_VERSION ${OpenImageIO_VERSION} CACHE INTERNAL
            "OpenImageIO version")
        set(MDL_DEPENDENCY_OPENIMAGEIO_IDIFF ${OpenImageIO_IDIFF} CACHE INTERNAL
            "OpenImageIO version")
        set(MDL_OPENIMAGEIO_FOUND ON CACHE INTERNAL "")

        if(MDL_LOG_DEPENDENCIES)
            message(STATUS "[INFO] MDL_DEPENDENCY_OPENIMAGEIO_INCLUDE:       ${MDL_DEPENDENCY_OPENIMAGEIO_INCLUDE}")
            message(STATUS "[INFO] MDL_DEPENDENCY_OPENIMAGEIO_LIB:           ${MDL_DEPENDENCY_OPENIMAGEIO_LIB}")
            message(STATUS "[INFO] MDL_DEPENDENCY_OPENIMAGEIO_VERSION:       ${MDL_DEPENDENCY_OPENIMAGEIO_VERSION}")
            message(STATUS "[INFO] MDL_DEPENDENCY_OPENIMAGEIO_IDIFF:         ${MDL_DEPENDENCY_OPENIMAGEIO_IDIFF}")
        endif()

    endif()

endfunction()