adding shared objects to catkin package

edit

Hi, i'm writing a node that has to call some functions from a .so library. The node called test_service_server has to use functions from libtest.so. This lib is NOT a catkin lib, it was created outside of ROS entirely.

inside my CMakeLists.txt i have the following:

include_directories( ${catkin_INCLUDE_DIRS} lib)
set(EXTRALIB_BIN ${PROJECT_SOURCE_DIR}/lib/libtest.so)
add_executable(test_service_server src/test_service_server.cpp)
target_link_libraries( test_service_server ${catkin_LIBRARIES} ${EXTRALIB_BIN})

I still get the error: no rule to make target.

Can someone give me a few tipps about linking shared objects to catkin packages?

EDIT: Just to explain my problem better: I have a shared object lib with ca 200 functions my node needs. ( in the /lib folder of the package) These functions are described in header files (ca. 10, in the /include folder of the package).

I can't get the source of this library to try and build it as a catkin lib. how do i properly link my .so in CMakeLists.txt?