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If you want to use a different version of opencv you will have to build and compile it and install it into the right place. You should not be building anything inside /opt/ros That is designated as read only without super user privleges for a reason. If you are mucking around in there manually installing things.

Please review how to build and compile targets we have instructions for overlay workspaces at: http://wiki.ros.org/catkin/Tutorials/workspace_overlaying and you should be installing opencv into the install space as well. ANd making sure that you've setup the appropriate environment variables so that your custom version of opencv is on the path.