I am trying to get ROS going under OS X with homebrew, and I have run into an issue. Several packages depend on python-numpy, which I would like to install through pip (homebrew doesn't provide a formula for this reason), but before I do that I need homebrew to install gfortran. So, do I add a new rosdep to each package that also depends on numpy, or should there a mechanism for inter package management dependencies. I know you can have several packages per installer rosdep (e.g. python: macports: python26 python_select), but that is only enough if both dependencies are in the same package management system.