tags 672433 confirmed thanks Oooops. I did not realized it worked magically in the past: $ apt-get source docbook-mathml -t testing $ cat docbook-mathml-1.0.0/debian/control | grep Dep Build-Depends: debhelper (>> 4.0.0) Depends: ${misc:Depends}, docbook-xml (>= 4.1.2-4), w3-dtd-mathml I'll fix this ASAP. Thanks.