AMCL example launch files are missing in Hydro

[Knifa]

I was following the robot setup tutorial on the ROS wiki and came to the point of creating my launch file when I noticed the example launch files from AMCL were missing.

Particularly, this line:

<include file="$(find amcl)/examples/amcl_omni.launch" />

Looking into the AMCL directory only shows the following files.

knifa@ubuntu:/opt/ros/hydro/share/amcl$ rosls amcl
    cmake  
    package.xml

I am expecting to find this file in there somewhere.

I tried to reinstall the Navigation stack via apt-get, in addition to using rosdep, but there was no change.

Running ROS Hydro on Ubuntu 12.04, with ROS (and the Navigation stack) installed from the repositories.