Hello! Just a quick one - when building packages for 21.11, I'm getting:
warning: failed to load external entity "/usr/share/xml/docbook/stylesheet/docbook-xsl-ns/manpages/docbook.xsl"
cannot parse /usr/share/xml/docbook/stylesheet/docbook-xsl-ns/manpages/docbook.xsl

I'm guessing this is due to dockbook-xsl-ns being missing from debian/control