According to the [documentation](http://wiki.ros.org/rosdep),
> rosdep is a command-line tool for installing system dependencies.
In the same documentation article, it is stated that `rosdep` can also be used to *install dependencies of all packages in the workspace*.
First of all, what is a system dependency? What isn't a system dependency? Can `rosdep` both be used to install system dependencies and package dependencies?
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