This is the shortest debian/rules file I’ve ever written:

#!/usr/bin/make -f
include /usr/share/cdbs/1/rules/debhelper.mk

Yes, that is the complete debian build file.

CDBS can very clearly say “nothing special in this package”. Everything else in this package is handled by debhelper defaults. Granted, this is a very simple package. But thats what I like about CDBS: don’t waste my time (or the time by someone reading the debian/rules file) when it is standard stuff.