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How to switch between ROS Hydro and ROS Indigo Version on Ubuntu 12.04?

I have installed both ROS Hydro and ROS Indigo on Ubuntu 12.04. I want to know how to switch between these versions when I am compiling a catkin workspace in Ubuntu. I have two catkin workspaces, one of them works with ROS Hydro and the other works with ROS Indigo. So, if I want to do a catkin build of the catkin workspace based on ROS Indigo, then what should I do?