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Opencv installation, usage with and without ROS

Hello, I have OpenCV 2.4.8 which was installed along with ROS Indigo on an Ubuntu 14.04. My project requires use of OpenCV 2.4.9. I have limited understanding of how this installation works. I have seen a few questions and answers related to this. But it is still not clear to me. So, I have a few questions:

  1. Can I install OpenCV 2.4.9 by following the normal installation method? If I do so will it break the version (2.4.8) linked with ROS Indigo?

  2. If I get OpenCV 2.4.9 installed, how can I get it to work with ROS Indigo? Also, once linked how to get it back in standalone mode?