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The answer that i need is "overlaying". When i was looking similar questions i found this answer http://answers.ros.org/question/37764/rosed-for-read-only-files/?answer=37768#post-id-37768

Anyway i just followed overlaying workspace tutorial. http://wiki.ros.org/catkin/Tutorials/workspace_overlaying.

Now i am able to modify the packages (in my case hector_slam) as i want.

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