[CMake] link to python

src/dynamic_graph/CMakeLists.txt

@@ -17,6 +17,8 @@ ADD_LIBRARY(${PYTHON_MODULE}
     signal-wrapper.cc
     )
 
+TARGET_LINK_LIBRARIES(${PYTHON_MODULE} ${PYTHON_LIBRARY})
+
 # Remove prefix lib
 SET_TARGET_PROPERTIES(${PYTHON_MODULE}
     PROPERTIES PREFIX "")