Perhaps the simplest thing to do would be to remove http://ftp.gnu.org/pub/gnu/regex/,
I doubt rms is thinking of that distribution, which, as you say, is way obsolete and should be deleted. (Maybe we should move regex.texi to Gnulib.) I suspect all he cares about is the regex source in Emacs. So, should I recommend trying the gnulib regex files in Emacs? Are there known incompatibilities? Or would the glibc regex be a better bet? (I doubt it, but.) And, please remind me in general how the gnulib and glibc regex are related at this point. This time I'll try to put it in the manual for our historical edification. Last I recall, we (you) were submitting tons of patches to glibc? Sorry for the continuing questions. Thanks, Karl