Problem by building the hector_lokalization package

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Hello

I tried to build the hector_localization package but could not. Im using Ubuntu 10.04 and ROS Fuerte. I got the following error.

Error: package/stack hector_pose_estimation_rtt depends on non-existent package rtt_rosnode


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


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

Any help??