Hi, i am trying to compile the hectornavigation stack. But by the hectorexploration_planner i get the following error:

mkdir -p bin cd build && cmake -Wdev -DCMAKETOOLCHAINFILE=rospack find rosbuild/rostoolchain.cmake .. [rosbuild] Building package hectorexplorationplanner [rosbuild] Cached build flags older than manifests; calling rospack to get flags Failed to invoke /opt/ros/fuerte/bin/rospack cflags-only-I;--deps-only hectorexplorationplanner CMake Error at /usr/lib/vtk-5.8/VTKTargets.cmake:16 (ADDEXECUTABLE): Command addexecutable() is not scriptable Call Stack (most recent call first): /usr/lib/vtk-5.8/VTKConfig.cmake:231 (INCLUDE) /usr/share/cmake-2.8/Modules/FindVTK.cmake:73 (FINDPACKAGE) /opt/ros/fuerte/stacks/perceptionpcl/pcl/vtkinclude.cmake:1 (findpackage)

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

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

Call Stack (most recent call first):
/opt/ros/fuerte/share/ros/core/rosbuild/public.cmake:227 (rosbuildinvokerospack)
CMakeLists.txt:14 (rosbuild_init)

-- Configuring incomplete, errors occurred! make: *** [all] Error 1

i am using ros fuerte on Ubuntu 12.04. All other PKG from the hector_navigation stack were compiled without error.