xen version 4.1.1-1ubuntu1 failed to build on armel

xen version 4.1.1-1ubuntu1 failed to build on armel
Link to failed build: https://launchpad.net/ubuntu/+source/xen/4.1.1-1ubuntu1/+build/2639668

Direct link to the build log: https://launchpad.net/ubuntu/+source/xen/4.1.1-1ubuntu1/+build/2639668/+files/buildlog_ubuntu-oneiric-armel.xen_4.1.1-1ubuntu1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 635 lines into the build log:

grep -v debian/changelog debian/control.md5sum | md5sum --check - --status || \
  /usr/bin/make -f debian/rules debian/control-real
dh_testdir
rm -rf debian/build debian/stamps debian/lib/python/debian_xen/*.pyc
dh_clean
 debian/rules build
grep -v debian/changelog debian/control.md5sum | md5sum --check - --status || \
  /usr/bin/make -f debian/rules debian/control-real
dh_testdir
/usr/bin/make -f debian/rules.gen setup_armel
make[1]: Entering directory `/build/buildd/xen-4.1.1'
make[1]: *** No rule to make target `setup_armel'. Stop.
make[1]: Leaving directory `/build/buildd/xen-4.1.1'
make: *** [debian/stamps/setup-base] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110809-1147
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/xen-4.1.1