Hi William, The new rosdep spec restricts each rule to specify one package manager: http://www.ros.org/reps/rep-0111.html#single-package-manager-per-rule As I understand that restriction, you'd have to switch the appropriate rosdep.yaml to pull graphviz via brew instead of macports. I think that the rationale is that we want to minimize sources of variation in the underlying system. brian. On Aug 7, 2011 4:24 PM, "William Woodall" wrote: