How to determine what package a node belongs to?

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Hi !

I have read the "Create a ros package tutorial" and I more or less understand what the tags <run_depend> and <build_depend> are for. My difficulty is to determine what I should put in the corresponding sections. For example, if I look at the code of the tf listener tutorial, I have the following includes:

#include <ros/ros.h>

#include <tf/transform_listener.h>

#include <turtlesim/Velocity.h>

#include <turtlesim/Spawn.h>

The questions I have are:

1. Are the includes enough to determine the dependencies?
2. How do I determine the package name from the include file name, e.g. for tf/transform_listener.h?
3. If dependencies can be deduced from the includes, is there some automatic tool to do it?

Thanks for any input.

      GGG