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if you mean build that you want to catkin_make, you cant do that in the src, you simply use the command cd.. (to go to catkin_ws) and then catkin_make

if you mean you want to clone a package from github, just create your own workspace (catkin_ws) in your home directory of course with the src, and then follow the instructions in the link you are provided with, dont rely on opt/ros/indigo... just go for your own workspace and explore the packages.