[CMake] Minor fix.

src/CMakeLists.txt

@@ -70,6 +70,7 @@ PKG_CONFIG_USE_DEPENDENCY(${LIBRARY_NAME} hpp-constraints)
 IF(HPP_WHOLEBODY_STEP_FOUND)
   PKG_CONFIG_USE_DEPENDENCY(${LIBRARY_NAME} hpp-wholebody-step)
 ENDIF(HPP_WHOLEBODY_STEP_FOUND)
+TARGET_LINK_LIBRARIES(${LIBRARY_NAME} ${Boost_LIBRARIES})
 
 INSTALL(TARGETS ${LIBRARY_NAME} DESTINATION lib)