error building groovy from source --> move_base_msgs notfound [closed]

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Hi, I have been following the instructions from www.ros.org/wiki/groovy/Installation/Source to build ROS Groovy on Gentoo x86_64 and it is nearly there! Just one thing fails for me right at the end. I would be very grateful for help in solving this.

The catkin ws is built and the rosbuild ws fails right at the end with this message:

{-------------------------------------------------------------------------------
  mkdir -p bin
  cd build && cmake -Wdev -DCMAKE_TOOLCHAIN_FILE=/opt/ros/groovy/share/ros/core/rosbuild/rostoolchain.cmake  ..
  [rosbuild] Building package simple_navigation_goals_tutorial
  Failed to invoke /opt/ros/groovy/bin/rospack deps-manifests simple_navigation_goals_tutorial
  [rospack] Error: package/stack 'simple_navigation_goals_tutorial' depends on non-existent package 'move_base_msgs' and rosdep claims that it is not a system dependency. Check the ROS_PACKAGE_PATH or try calling 'rosdep update'


  CMake Error at /opt/ros/groovy/share/ros/core/rosbuild/public.cmake:129 (message):


    Failed to invoke rospack to get compile flags for package
    'simple_navigation_goals_tutorial'.  Look above for errors from rospack
    itself.  Aborting.  Please fix the broken dependency!

  Call Stack (most recent call first):
    /opt/ros/groovy/share/ros/core/rosbuild/public.cmake:203 (rosbuild_invoke_rospack)
    CMakeLists.txt:12 (rosbuild_init)


  -- Configuring incomplete, errors occurred!
-------------------------------------------------------------------------------}

I have searched for the move_base_msgs package and it does not exist on my computer. How do I install this package so I can move on to bigger and better things :)

Thanks again for your help.