Hi, For any package where does one look to see what external packages are needed for any ros thingy. I thought I had sorted the boost and log4cxx but obviously not. rosdep install roscpp Failed to find rosdep boost for package roscpp on OS:debian version:squeeze Failed to find rosdep log4cxx for package roscpp on OS:debian version:squeeze ERROR: ABORTING: Rosdeps [u'boost', u'log4cxx'] could not be resolved So I am manually installing anything that needs installing but the boost and log4cxx have me completely at a loss. M. -- Mark Worsdall http://www.shadowrobot.com/ need a hand??