We have an old version of GUD. The Ruby package assumes a newer version
is available. It calls gud-common-init with 4 arguments (in
rubydb3x.el, in function rubydb), but our version only supports 2
arguments. I have not yet compared the old and new GUDs to see what has
changed.
--
Jerry James
http://www.ittc.ku.edu/~james/