Minimal debian/rules for dh7+dpatch

I got a new package to start from scratch (amule-emc, ITP) so I wanted to try debhelper 7. In need of patching upstream source code, I used my old friend dpatch, but then started to have some problems putting things together; so, here below is the minimal debian/rules to use dh7+dpatch:

#!/usr/bin/make -f
include /usr/share/dpatch/dpatch.make

build: build-stamp
build-stamp: patch-stamp
      dh build
      touch $@

clean:
      dh clean

%:
      dh $@

Thanks to jcristau and noshadow from #debian-devel@OFTC for opening my eyes ;)

Edited: thanks to Joey's comment, I was able to reduce it again down to:

#!/usr/bin/make -f

include /usr/share/dpatch/dpatch.make

build: patch-stamp
       dh build

clean: unpatch
       dh clean

%:
       dh $@