Installation of PR2 simulation

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i followed the instruction from: http://www.ros.org/wiki/pr2_simulator/Tutorials/StartingPR2Simulation after making the full installation of ros fuerte and i got this error:

lab116@ubuntu:~$ rosmake pr2_gazebo [rosmake ] rosmake starting...         
[ rosmake ] Packages requested are:
['pr2_gazebo']                        
[ rosmake ] Logging to directory
/home/lab116/.ros/rosmake/rosmake_output-20120809-123551
[ rosmake ] Expanded args
['pr2_gazebo'] to: []                 
[ rosmake ] **WARNING: The following
args could not be parsed as stacks or**
packages: ['pr2_gazebo'] [ rosmake ]
**ERROR: **No arguments could be parsed into valid package or stack names.****

i tried to install the pr2_gazebo:

lab116@ubuntu:~$ rosdep  install pr2_gazebo

ERROR: Rosdep cannot find all required
resources to answer your query Missing
resource pr2_gazebo ROS path
[0]=/opt/ros/fuerte/share/ros ROS path
[1]=/opt/ros/fuerte/share ROS path
[2]=/opt/ros/fuerte/stacks

How do i install this pkg?