message: Require at least v1.6.5 of OIIO, which fixed a bug with flipped pfms
  See also
diff: @@ -54,7 +54,7 @@ ENDIF()
  OPTION(OSPRAY_SG_OPENIMAGEIO "Enable OpenImageIO support" OFF)
  IF(OSPRAY_SG_OPENIMAGEIO)
  - FIND_PACKAGE(OpenImageIO)
  + FIND_PACKAGE(OpenImageIO 1.6.5)
  IF (OPENIMAGEIO_FOUND)
  ADD_DEFINITIONS(-DUSE_OPENIMAGEIO)
  INCLUDE_DIRECTORIES(${OPENIMAGEIO_INCLUDE_DIRS})
  