Force finding OpenEXR / IlmBase instead of imath for now.
--- a/src/cmake/modules/FindOpenEXR.cmake
+++ b/src/cmake/modules/FindOpenEXR.cmake
@@ -39,43 +39,10 @@
 #
 
 # First, try to fine just the right config files
-find_package(Imath CONFIG)
-if (NOT TARGET Imath::Imath)
-    # Couldn't find Imath::Imath, maybe it's older and has IlmBase?
-    find_package(IlmBase CONFIG)
-endif ()
+find_package(IlmBase CONFIG)
 find_package(OpenEXR CONFIG)
 
-if (TARGET OpenEXR::OpenEXR AND TARGET Imath::Imath)
-    # OpenEXR 3.x if both of these targets are found
-    set (FOUND_OPENEXR_WITH_CONFIG 1)
-    if (NOT OpenEXR_FIND_QUIETLY)
-        message (STATUS "Found CONFIG for OpenEXR 3 (OPENEXR_VERSION=${OpenEXR_VERSION})")
-    endif ()
-
-    # Mimic old style variables
-    set (OPENEXR_VERSION ${OpenEXR_VERSION})
-    get_target_property(IMATH_INCLUDES Imath::Imath INTERFACE_INCLUDE_DIRECTORIES)
-    get_target_property(ILMBASE_INCLUDES Imath::Imath INTERFACE_INCLUDE_DIRECTORIES)
-    get_target_property(ILMBASE_IMATH_LIBRARY Imath::Imath INTERFACE_LINK_LIBRARIES)
-    get_target_property(IMATH_LIBRARY Imath::Imath INTERFACE_LINK_LIBRARIES)
-    get_target_property(OPENEXR_IEX_LIBRARY OpenEXR::Iex INTERFACE_LINK_LIBRARIES)
-    get_target_property(OPENEXR_ILMTHREAD_LIBRARY OpenEXR::IlmThread INTERFACE_LINK_LIBRARIES)
-    set (ILMBASE_LIBRARIES ${ILMBASE_IMATH_LIBRARY})
-    set (ILMBASE_FOUND true)
-
-    get_target_property(OPENEXR_INCLUDES OpenEXR::OpenEXR INTERFACE_INCLUDE_DIRECTORIES)
-    get_target_property(OPENEXR_ILMIMF_LIBRARY OpenEXR::OpenEXR INTERFACE_LINK_LIBRARIES)
-    set (OPENEXR_LIBRARIES ${OPENEXR_ILMIMF_LIBRARY} ${OPENEXR_IEX_LIBRARY} ${OPENEXR_ILMTHREAD_LIBRARY} ${ILMBASE_LIBRARIES})
-    set (OPENEXR_FOUND true)
-
-    # Link with pthreads if required
-    find_package (Threads)
-    if (CMAKE_USE_PTHREADS_INIT)
-        list (APPEND ILMBASE_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
-    endif ()
-
-elseif (TARGET OpenEXR::IlmImf AND TARGET IlmBase::Imath AND
+if (TARGET OpenEXR::IlmImf AND TARGET IlmBase::Imath AND
         (OPENEXR_VERSION VERSION_GREATER_EQUAL 2.4 OR OpenEXR_VERSION VERSION_GREATER_EQUAL 2.4))
     # OpenEXR 2.4 or 2.5 with exported config
     set (FOUND_OPENEXR_WITH_CONFIG 1)