> 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.

Please ignore this ping, Anders.