slib ChangeLog shows 3.1.1 being marked -x86 because of bug 41983 but it wasn't unmarked when that bug was closed.
-x86 -> x86
3.1.4 still to be done. To test, start guile guile> (prime? 13) it shouldn't work, since slib wasn't loaded yet guile> (use-modules (ice-9 slib)) guile> (require 'primes) guile> (prime? 13) output should be #t (true).
Now we are done.