IF (DEFINED CACHED_OPENEXR)

  # in cache already
  IF ("${CACHED_OPENEXR}" STREQUAL "YES")
    SET(OPENEXR_FOUND TRUE)
  ENDIF ("${CACHED_OPENEXR}" STREQUAL "YES")

ELSE (DEFINED CACHED_OPENEXR)

  # use pkg-config to get the directories and then use these values
  # in the FIND_PATH() and FIND_LIBRARY() calls
  INCLUDE(UsePkgConfig)
  
  PKGCONFIG(OpenEXR _OpenEXRIncDir _OpenEXRLinkDir _OpenEXRLinkFlags _OpenEXRCflags)
  
  FIND_PATH(OPENEXR_INCLUDE_DIR ImfRgbaFile.h
     ${_OpenEXRIncDir}
     ${_OpenEXRIncDir}/OpenEXR/
     /usr/include
     /usr/local/include
  )
  
  FIND_LIBRARY(OPENEXR_HALF_LIBRARY NAMES Half
    PATHS
    ${_OPENEXRLinkDir}
    /usr/lib
    /usr/local/lib
  )
  
  
  FIND_LIBRARY(OPENEXR_IEX_LIBRARY NAMES Iex
    PATHS
    ${_OPENEXRLinkDir}
    /usr/lib
    /usr/local/lib
  )
  
  FIND_LIBRARY(OPENEXR_IMATH_LIBRARY NAMES Imath
    PATHS
    ${_OPENEXRLinkDir}
    /usr/lib
    /usr/local/lib
  )
  
  
  FIND_LIBRARY(OPENEXR_ILMIMF_LIBRARY NAMES IlmImf 
    PATHS
    ${_OPENEXRLinkDir}
    /usr/lib
    /usr/local/lib
  )
  
  set(OPENEXR_LIBRARIES ${OPENEXR_HALF_LIBRARY} ${OPENEXR_IMATH_LIBRARY} )
  
  if (OPENEXR_INCLUDE_DIR AND OPENEXR_IMATH_LIBRARY AND OPENEXR_ILMIMF_LIBRARY  AND OPENEXR_IEX_LIBRARY AND OPENEXR_HALF_LIBRARY)
     set(OPENEXR_FOUND TRUE)
     set(OPENEXR_LIBRARIES ${OPENEXR_IMATH_LIBRARY} ${OPENEXR_ILMIMF_LIBRARY} ${OPENEXR_IEX_LIBRARY} ${OPENEXR_HALF_LIBRARY} CACHE STRING "The libraries needed to use OpenEXR")
  endif (OPENEXR_INCLUDE_DIR AND OPENEXR_IMATH_LIBRARY AND OPENEXR_ILMIMF_LIBRARY AND OPENEXR_IEX_LIBRARY AND OPENEXR_HALF_LIBRARY)
  
  
  
  if (OPENEXR_FOUND)
    set(CACHED_OPENEXR "YES")
    if (NOT OpenEXR_FIND_QUIETLY)
      message(STATUS "Found OPENEXR: ${OPENEXR_LIBRARIES}")
    endif (NOT OpenEXR_FIND_QUIETLY)
  else (OPENEXR_FOUND)
    set(CACHED_OPENEXR "NO")
    if (OpenEXR_FIND_REQUIRED)
      message(FATAL_ERROR "Could NOT find OPENEXR")
    endif (OpenEXR_FIND_REQUIRED)
  endif (OPENEXR_FOUND)
  
  MARK_AS_ADVANCED(
     OPENEXR_INCLUDE_DIR 
     OPENEXR_LIBRARIES 
     OPENEXR_ILMIMF_LIBRARY 
     OPENEXR_IMATH_LIBRARY 
     OPENEXR_IEX_LIBRARY 
     OPENEXR_HALF_LIBRARY )
  
  set(CACHED_OPENEXR ${CACHED_OPENEXR} CACHE INTERNAL "If openexr was checked")

ENDIF (DEFINED CACHED_OPENEXR)