lazr.restful version 0.9.29-0ubuntu1 failed to build in oneiric

lazr.restful version 0.9.29-0ubuntu1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2698969

Details about the rebuild:
http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20110816-oneiric.html

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2698969/+files/buildlog_ubuntu-oneiric-i386.lazr.restful_0.9.29-0ubuntu1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 403 lines into the build log:

dpkg-source: info: upstream files that have been modified:
 lazr.restful-0.9.29/COPYING
dpkg-buildpackage: export CFLAGS from dpkg-buildflags (origin: vendor): -g -O2
dpkg-buildpackage: export CPPFLAGS from dpkg-buildflags (origin: vendor):
dpkg-buildpackage: export CXXFLAGS from dpkg-buildflags (origin: vendor): -g -O2
dpkg-buildpackage: export FFLAGS from dpkg-buildflags (origin: vendor): -g -O2
dpkg-buildpackage: export LDFLAGS from dpkg-buildflags (origin: vendor): -Wl,-Bsymbolic-functions
dpkg-buildpackage: source package lazr.restful
dpkg-buildpackage: source version 0.9.29-0ubuntu1
 dpkg-source --before-build lazr.restful-0.9.29
dpkg-buildpackage: host architecture i386
 /usr/bin/fakeroot debian/rules clean
debian/rules:7: /usr/share/cdbs/1/rules/langpack.mk: No such file or directory
make: *** No rule to make target `/usr/share/cdbs/1/rules/langpack.mk'. Stop.
dpkg-buildpackage: error: /usr/bin/fakeroot debian/rules clean gave error exit status 2
******************************************************************************
Build finished at 20110823-0331
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/lazr.restful-0.9.29