Hi guys, after the successful installation of rviz_qt, I tried to make Stage4 to work with the new rviz_qt as mentioned in this post. I have applied patches here and here,successfully installed Stage4 by homebrew. However I have got the same problem which is mentioned here. My question is, since I have already had the Stage4 installed, why shall I still have to compile stage from source? My understand is Stage4 is a standalone simulator, and stageros is just a ros wrapper of stage. When working together, stageros node provides interface between ros and stage. Is it right?