Hi David Thank you for your reply. Polonius really appeals to me particularly because of the antecedence to Wizard of Oz ! LOL ! I have downloaded the wu-ros-pkg (all of it). I tried to make polonius (rosmake polonius) - but got dependency errors in there, probably I am doing something wrong. Then again some sort of installation help (I am more of a rookie) will always help. Here are the errors; CMake Error at /opt/ros/diamondback/ros/core/rosbuild/public.cmake:113 (message): Failed to invoke rospack to get compile flags for package 'polonius_engine'. Look above for errors from rospack itself. Aborting. Please fix the broken dependency! Call Stack (most recent call first): /opt/ros/diamondback/ros/core/rosbuild/public.cmake:183 (rosbuild_invoke_rospack) CMakeLists.txt:12 (rosbuild_init) -- Configuring incomplete, errors occurred! -------------------------------------------------------------------------------} [ rosmake ] Output from build of package polonius_engine written to: [ rosmake ] /home/acer/.ros/rosmake/rosmake_output-20110927-001024/polonius_engine/build_output.log [rosmake-1] Finished <<< polonius_engine [FAIL] [ 1.02 seconds ] [ rosmake ] Halting due to failure in package polonius_engine. [ rosmake ] Waiting for other threads to complete. [rosmake-0] Finished <<< polonius_msgs [PASS] [ 5.94 seconds ] [ rosmake ] Results: [ rosmake ] Built 9 packages with 1 failures. [ rosmake ] Summary output to directory [ rosmake ] /home/acer/.ros/rosmake/rosmake_output-20110927-001024 On 26 September 2011 20:52, David Lu!! wrote: > Polonius is not in active development, meaning we haven't updated it in > awhile. It's by no means a dead project, we've just been working on other > things. > > I've begun a tutorial here (http://www.ros.org/wiki/polonius/Tutorials) > although I admit it isn't fully fleshed out. Have you checked out the code > in polonius_demo? That might be a good starting place. > > -David!! > > -- Arkapravo Bhaumik E-mail : arkapravobhaumik@gmail.com Blogs : http://mobotica.blogspot.com/, http://3chevrons.blogspot.com/ Twitter : @abhaumik Facebook : arkapravo@facebook.com Skype : arkapravo