Merge pull request #3866 from tdsmith:python-linkage

modules/python/common.cmake

@@ -49,9 +49,13 @@ ocv_add_library(${the_module} SHARED ${PYTHON_SOURCE_DIR}/src2/cv2.cpp ${cv2_gen
 
 if(PYTHON_DEBUG_LIBRARIES AND NOT PYTHON_LIBRARIES MATCHES "optimized.*debug")
   ocv_target_link_libraries(${the_module} debug ${PYTHON_DEBUG_LIBRARIES} optimized ${PYTHON_LIBRARIES})
+else()
+  if(APPLE)
+    set_target_properties(${the_module} PROPERTIES LINK_FLAGS "-undefined dynamic_lookup")
   else()
     ocv_target_link_libraries(${the_module} ${PYTHON_LIBRARIES})
   endif()
+endif()
 ocv_target_link_libraries(${the_module} ${OPENCV_MODULE_${the_module}_DEPS})
 
 execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_var('SO'))"