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I think you're on the right track with this; some of the internal interfaces in rosdep changed with Electric, and I don't think all of the installers have been updated yet.
When I worked on the Gentoo installer, I used the Ubuntu installer as a reference; it's well-maintained because most ROS development happens on Ubuntu.
There's some documentation about adding an OS to rosdep on the wiki, but it looks like it's rather out of date: http://ros.org/wiki/rosdep/Tutorials/Add%20Support%20for%20an%20OS%20to%20rosdep