> Why him? I don't see any changes he made in ucs-normalize.el. Do you?
Sorry, I saw that that commit by Anders added the (require 'ucs-normalize) and thought that this error was related to that. I just rebuilt using that commit and the build finished fine.
> Does reverting 0905307 solves the problem?
Actually I just finished building using make bootstrap from the lastest commit on emacs-25 and it finished fine.