Help with Installing packages and repositories

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Generally you should not install packages by hand in system directories such as /opt/ros/diamondback. People normally create an overlay in their home directory. An easy way of creating such an overlay (and installing stacks/packages) is by using rosinstall. To create an overlay in ~/ros, you can do the following:

rosinstall ~/ros /opt/ros/diamondback

Then replace the line

source /opt/ros/diamondback/setup.bash

in your ~/.bashrc with the line

source ~/ros/setup.bash

Now, if you want to install a new stack that is not available as a debian package (e.g. bosch_drivers which contains usb_cam), execute the following:

roslocate info bosch_drivers > ~/bosh_drivers.rosinstall
rosinstall ~/ros ~/bosh_drivers.rosinstall

After opening a new terminal to reload setup.bash you will have the package usb_cam in your package path and you should be able to rosmake it.