Hi Tully, Thank you for these explanations, I now understand better the motivations behind the current system. As gps_umd provides the definition of the "extended" gps messages and does not compile, it is a problem for dependencies. If the maintainer is on this list, maybe one should move the message definitions to their own stack to prevent dependency problems? Our stack ethzasl_aseba compiles fine on fuerte excepted for oneiric_i386 [1], as it seems that some basic stacks are missing (like common). I guess it is a known problem, do you know when it will be fixed? Thank you, kind regards, Stéphane [1] http://build.willowgarage.com/job/prerelease_fuerte_ethzasl_aseba_oneiric_i386/2/console -- Dr Stéphane Magnenat http://stephane.magnenat.net