-EngineFrameAdjustArea *engine_frame_adjust_area;
-EngineFrameAdjustShape *engine_frame_adjust_shape;
-EngineFrameAdjustState *engine_frame_adjust_state;
-EngineFrameAdjustFocus *engine_frame_adjust_focus;
-EngineFrameAdjustTitle *engine_frame_adjust_title;
-EngineFrameAdjustIcon *engine_frame_adjust_icon;
+extern EngineFrameAdjustArea *engine_frame_adjust_area;
+extern EngineFrameAdjustShape *engine_frame_adjust_shape;
+extern EngineFrameAdjustState *engine_frame_adjust_state;
+extern EngineFrameAdjustFocus *engine_frame_adjust_focus;
+extern EngineFrameAdjustTitle *engine_frame_adjust_title;
+extern EngineFrameAdjustIcon *engine_frame_adjust_icon;