Mine

post-patches:: debian/stamp-bootstrap

# Update libtool files and regenerate autotools files afterwards.
# config.(guess|sub) is updated by cdbs automatically.
debian/stamp-bootstrap:
        autoreconf -vfi  
        touch debian/stamp-bootstrap

# Remove autogenerated files.
clean::
        find . -name Makefile.in | xargs rm -f
        rm -f aclocal.m4
        rm -f ltmain.sh
        rm -f configure
        rm -f po/stamp-po
        rm -f debian/stamp-bootstrap