Whops, rc2 was missing a file. I always run "make distcheck", which should catch these, but recently it has always failed due to clang static checking giving one "error" that I didn't really want to fix. Because of that the distcheck didn't finish and didn't check for the missing file.
So, anyway, I've made clang happy again, and now that I see how bad idea it is to just ignore the failed distcheck, I won't do that again in future. :)