Re: [PATCH v3] Documentation: fix build with Asciidoctor 2

> > > diff --git a/ci/test-documentation.sh b/ci/test-documentation.sh
> > > index d49089832d..b3e76ef863 100755
> > > --- a/ci/test-documentation.sh
> > > +++ b/ci/test-documentation.sh
> > > @@ -8,6 +8,8 @@
> > >  filter_log () {
> > >  	sed -e '/^GIT_VERSION = /d' \
> > >  	    -e '/^    \* new asciidoc flags$/d' \
> > > +	    -e '/stripped namespace before processing/d' \
> > > +	    -e '/Attributed.*IDs for element/d' \
> > 
> > I haven't seen this latter message in the CI builds, neither with
> > Asciidoctor v1.5.8 nor with v2.  Do we really need this filter, then?
> > Where does this message come from?
> 
> I see it and it definitely fails on my system without it.  It comes from
> libxslt, which has been patched in Debian to produce deterministic IDs.
> I suspect we may not have seen it on Ubuntu systems because they are
> running 16.04, which is likely older than the patch.  If Travis updates
> to 18.04, we may be more likely to have a problem.