phonon version 4:4.7.0really4.5.0-3ubuntu3 failed to build in oneiric

phonon version 4:4.7.0really4.5.0-3ubuntu3 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2707946

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/2707946/+files/buildlog_ubuntu-oneiric-i386.phonon_4%3A4.7.0really4.5.0-3ubuntu3_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1615 lines into the build log:

-- Installing: /build/buildd/phonon-4.7.0really4.5.0/debian/tmp/usr/include/KDE/Phonon/Experimental/AudioDataOutput
-- Installing: /build/buildd/phonon-4.7.0really4.5.0/debian/tmp/usr/include/KDE/Phonon/Experimental/SnapshotInterface
-- Installing: /build/buildd/phonon-4.7.0really4.5.0/debian/tmp/usr/include/KDE/Phonon/Experimental/VideoDataOutput
-- Installing: /build/buildd/phonon-4.7.0really4.5.0/debian/tmp/usr/include/KDE/Phonon/Experimental/VideoDataOutputInterface
-- Installing: /build/buildd/phonon-4.7.0really4.5.0/debian/tmp/usr/include/KDE/Phonon/Experimental/VideoFrame
-- Installing: /build/buildd/phonon-4.7.0really4.5.0/debian/tmp/usr/include/KDE/Phonon/Experimental/VideoFrame2
-- Installing: /build/buildd/phonon-4.7.0really4.5.0/debian/tmp/usr/include/KDE/Phonon/Experimental/Visualization
make[2]: Leaving directory `/build/buildd/phonon-4.7.0really4.5.0/obj-i686-linux-gnu'
dh_install -O'--dbg-package=phonon-dbg'
cp: cannot stat `debian/tmp/usr/lib/qt4/plugins/designer/libphononwidgets.so': No such file or directory
dh_install: cp -a debian/tmp/usr/lib/qt4/plugins/designer/libphononwidgets.so debian/libphonon-dev//usr/lib/qt4/plugins/designer/ returned exit code 1
make[1]: *** [pre_install_dh_install] Error 2
make[1]: Leaving directory `/build/buildd/phonon-4.7.0really4.5.0'
make: *** [debian/dhmk_install] Error 2
dpkg-buildpackage: error: /usr/bin/fakeroot debian/rules binary gave error exit status 2
******************************************************************************
Build finished at 20110818-0716
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/phonon-4.7.0really4.5.0