problems with points_and_lines tutorial

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I'm new to Ubuntu and ROS and I'm trying to use your tutorial to get myself started with rviz and ROS visualization capabilities. Ultimately I want to read from SICK LiDAR and visualize the point clouds generated from that.

I am encountering errors trying to run the tutorial here, and hoped you could help me.

First in my ros_workspace I created a package using_markers

Then I created a file points_and_lines.cpp and pasted your code into it

I then copied points_and_lines.cpp into an srv folder in the using_markers package using roscp

This all executed without a problem

Where I began encountering issues was when I tried to execute rosmake on the file as instructed in the tutorial. 14/15 operations execute, but the 15th fails issuing the warning WARNING: Skipped command line arguments: ['points_and_lines.cpp'] because they could not be resolved to a stack name or a package name.

As I said I am new to Linux and ROS and I imagine I have made some strange syntax errror; have you ever encountered this before and how can I resolve it?