clutter-gesture version 0.0.2.1-2ubuntu1 failed to build in oneiric

clutter-gesture version 0.0.2.1-2ubuntu1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2690447

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/2690447/+files/buildlog_ubuntu-oneiric-amd64.clutter-gesture_0.0.2.1-2ubuntu1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1099 lines into the build log:

gesture_recog.c: In function 'compute_ols':
gesture_recog.c:139:17: error: variable 'lyy' set but not used [-Werror=unused-but-set-variable]
gesture_recog.c:138:12: error: variable 's_s' set but not used [-Werror=unused-but-set-variable]
gesture_recog.c: In function 'gesture_process':
gesture_recog.c:845:11: error: variable 'point' set but not used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

make[3]: *** [gesture_recog.lo] Error 1
make[3]: Leaving directory `/build/buildd/clutter-gesture-0.0.2.1/engine'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/clutter-gesture-0.0.2.1'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/clutter-gesture-0.0.2.1'
make: *** [debian/stamp-makefile-build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110820-0550
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/clutter-gesture-0.0.2.1