Unfortunately, the #if NOTYET have been in the Xorg tree from the beginning, and even if the first CVS XFree86 commit of libxkbfile on 1996/01/03. So it's kind of hard to tell whether this "yet" refers to soon or year 2090. I suggest you report a bug to https://bug.freedesktop.org/ and hope you'll get an answer :/ Brice