SET(HDF5_EXTRA_FLAGS "@HDF5_EXTRA_FLAGS@")
IF (VTK_USE_MPI)
  INCLUDE_DIRECTORIES(@HDF5_MPI_INCLUDE_PATH@)
ENDIF (VTK_USE_MPI)  

SET(HDF5_EXTRA_FLAGS "@HDF5_EXTRA_FLAGS@")
SET(HDF5_ENABLE_PARALLEL @HDF5_ENABLE_PARALLEL@)
IF (VTK_USE_MPI AND HDF5_ENABLE_PARALLEL)
  SET(HDF5_MPI_INCLUDE_PATH "@HDF5_MPI_INCLUDE_PATH@")
  INCLUDE_DIRECTORIES(${HDF5_MPI_INCLUDE_PATH})
ENDIF (VTK_USE_MPI AND HDF5_ENABLE_PARALLEL)

Include paths with spaces and/or multiple paths were not handled properly. This should do it.
COMP: Include paths with spaces and/or multiple paths were not handled properly. This should do it.
