Problem with Orocos OCL Template V1.6.0

Hello,
I'm having problem compiling the Orocos OCL Template V1.6.0. At the end of the cmake command, I always get the following error :

CMake Error: The RTT Library could not be located. Please use -DOROCOS_INSTALL=/path/to/ocl

It seems that RTT_FOUND is never set by the CMake configuration files. It works if I comment the last 3 lines of CMakeLists.txt :

IF (NOT RTT_FOUND )
MESSAGE( FATAL_ERROR "The RTT Library could not be located. Please use -DOROCOS_INSTALL=/path/to/ocl")
ENDIF( NOT RTT_FOUND)

Philippe Hamelin