Logging Real time with ros, problem with the example

Hi to all, I'm a ros user and I try to run the example with mix of log4cpp and OCL::logging implementations.
I create an eclipse project and I have many problem.. The first:

/opt/ros/electric/stacks/locomachs/testlogging.cpp:40: undefined reference to `OCL::logging::Category::createOCLCategory(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, log4cpp::Category*, int)'

for the line
// use only OCL::logging Category's log4cpp::HierarchyMaintainer::set_category_factory(OCL::logging::Category::createOCLCategory);

I use Ros electric, and this is my CMakeList

cmake_minimum_required(VERSION 2.6.3)
project(locomachs)

if (ROS_ROOT)
include($ENV{ROS_ROOT}/core/rosbuild/rosbuild.cmake)
rosbuild_init()
rosbuild_find_ros_package( rtt )
set( RTT_HINTS HINTS ${rtt_PACKAGE_PATH}/install )
endif()
rosbuild_find_ros_package(rtt )
rosbuild_find_ros_package(ocl)
rosbuild_find_ros_package(ocl/logging)
#
INCLUDE_DIRECTORIES( ${LOG4CPP_INCLUDE_DIRS} )
LINK_DIRECTORIES( ${LOG4CPP_LIBRARY_DIRS} )

#

find_package(OROCOS-RTT REQUIRED ${RTT_HINTS})
include(${OROCOS-RTT_USE_FILE_PATH}/UseOROCOS-RTT.cmake)

# Set the CMAKE_PREFIX_PATH in case you're not using Orocos through ROS
# for helping these find commands find RTT.
find_package(OROCOS-RTT REQUIRED ${RTT_HINTS})

# Defines the orocos_* cmake macros. See that file for additional
# documentation.
include(${OROCOS-RTT_USE_FILE_PATH}/UseOROCOS-RTT.cmake)

orocos_component(locomachs locomachs-component.hpp locomachs-component.cpp)

orocos_component(orocos-logging-tests TestComponent.cpp TestLoggingAvailability.cpp )

target_link_libraries(orocos-logging-tests orocos-ocl-logging log4cpp)

orocos_component(testlogging testlogging.cpp)

target_link_libraries(testlogging orocos-ocl-logging)

# Creates an orocos executable HelloWorld
orocos_use_package(ocl-taskbrowser)
orocos_executable(Data DataFlowTask.cpp)
orocos_executable(Data2 testlogging.cpp)

orocos_generate_package()

EXECUTE_PROCESS(COMMAND ${CMAKE_COMMAND} -E create_symlink
${CMAKE_CURRENT_SOURCE_DIR}/data ${CMAKE_CURRENT_BINARY_DIR}/data)

#####################################

any ideas?