Hey, I couldn't get the @U macro to work. Am I missing something? I noticed. You need the latest Texinfo for it -- I was jumping the gun. You can get http://ftpmirror.gnu.org/texinfo/texinfo.tex to have it in the TeX runs. For makeinfo, there is a pretest at http://alpha.gnu.org/gnu/texinfo/texinfo-5.9.91.tar.xz if you want to try it. I hope we'll release 6.0 sometime next week.
And, I just this minute had trouble getting a changed copy. What kind of trouble? I did interrupt a commit earlier today, but I thought everything was settled down. I assume that you are working on it? That shouldn't matter one way or another, but anyway, not right now. karl