Ho to export external library

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I created a library in OpenCV where I implemented some image processing. The *.so file i copied to /usr/local/lib. I'm still using Fuerte. I want to link on of my node with this library to use my functions. What is the best way to link the library?

First I complied the library:

$ g++ ``pkg-config --cflags opencv`` -o RailwayImageProcess.o -c RailwayImageProcess.c ``pkg-config --libs opencv``

$ g++ RailwayImageProcess.o -Wall -g -shared -o RailwayImageProcess.so

Than i copied the *.so to /usr/local/lib

I tired adding to my CMakeList.txt the folowing lines:

link_directories(/usr/local/lib)

target_link_libraries(${PROJECT_NAME} RailwayImageProcess)

Finally i run a cmake . and make But I get an error in Linking phase: Linking CXX executable bin/railDetect /usr/bin/ld: cannot find -lRailwayImageProcess collect2: ld returned 1 exit status make[2]: * [bin/railDetect] Error 1 make[1]: [CMakeFiles/railDetect.dir/all] Error 2 make: ** [all] Error 2