[CMake] install target instead of file

python/CMakeLists.txt

@@ -20,7 +20,7 @@ ENDIF(APPLE)
 PKG_CONFIG_USE_DEPENDENCY(spline eigenpy)
 
 INSTALL(
-	FILES ${LIBRARY_OUTPUT_PATH}spline.so	DESTINATION ${PYTHON_SITELIB}
+  TARGETS spline	DESTINATION ${PYTHON_SITELIB}
 )
 
 ADD_PYTHON_UNIT_TEST("python-spline" "python/test/test.py" "python")