Issues creating a rosbuild overlay on top of catkin packages

edit

I'm having an issue similar to 49825/how-do-i-create-a-rosbuild-overlay-on-a-catkin-workspace

http://answers.ros.org/question/49825/how-do-i-create-a-rosbuild-overlay-on-a-catkin-workspace/

That is, I'm attempting a fresh ROS groovy source install using the installation guide on a fresh copy of Ubuntu 12.04, and it seems my ROS_PACKAGE_PATH is not setup correctly.

This command:

sudo dpkg -s python-rosinstall

Gives:

...
Maintainer: Tully Foote <<a href="mailto:tfoote@willowgarage.com">tfoote@willowgarage.com</a>>
Architecture: all
Source: rosinstall
Version: 0.6.22-1
Provides: python2.6-rosinstall
...

I have my workspace setup as specified by the instructions, thus, my directory structure looks like this:

wet workspace:

$HOME/ros_catkin_ws/
 ../devel_isolated/
 ../install_isolated/
 ../src/
 ...

dry workspace:

$HOME/ros_ws/
 ../<dry_package_1>
 ../<dry_package_2>
 ../<dry_package_3>
 ../setup.sh
 ../setup.bash
 ...

Before attempting to build my dry packages using rosmake, I source $HOME/ros_ws/setup.bash. And then invoke rosmake in the package i'd like to build. This results in output like:

[rosmake-0] Starting >>> turtlebot_driver [ make ]
[rosmake-1] Starting >>> turtlebot_description [ make ]
[rosmake-2] Starting >>> turtlebot_node [ make ]       
[rosmake-3] Starting >>> pointcloud_to_laserscan [ make ]
[rosmake-0] Finished <<< turtlebot_driver [SKIP] No rule to make target None
[rosmake-0] Starting >>> turtlebot_bringup [ make ]
[rosmake-3] Finished <<< pointcloud_to_laserscan [SKIP] No rule to make target None 
[rosmake-2] Finished <<< turtlebot_node [SKIP] No rule to make target None 
 ...

If I execute the following command:

ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:$HOME/ros_catkin_ws/src/

Then the packages will build as I expect. Can someone please point out my mistake?