svox version 1.0+git20100205-2.1 failed to build in oneiric

svox version 1.0+git20100205-2.1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2712418

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/2712418/+files/buildlog_ubuntu-oneiric-i386.svox_1.0%2Bgit20100205-2.1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 667 lines into the build log:

mv -f .deps/pico2wave-pico2wave.Tpo .deps/pico2wave-pico2wave.Po
/bin/bash ./libtool --tag=CC --mode=link gcc -Wall -Dpicolangdir=\"/usr/share/pico/lang\" -I lib -lm -lpopt -g -O2 -Wl,-Bsymbolic-functions -o pico2wave pico2wave-pico2wave.o libttspico.la
libtool: link: gcc -Wall -Dpicolangdir=\"/usr/share/pico/lang\" -I lib -g -O2 -Wl,-Bsymbolic-functions -o .libs/pico2wave pico2wave-pico2wave.o -lm /usr/lib/libpopt.so ./.libs/libttspico.so
./.libs/libttspico.so: undefined reference to `sin'
./.libs/libttspico.so: undefined reference to `exp'
./.libs/libttspico.so: undefined reference to `cos'
./.libs/libttspico.so: undefined reference to `sqrt'
collect2: ld returned 1 exit status
make[2]: *** [pico2wave] Error 1
make[2]: Leaving directory `/build/buildd/svox-1.0+git20100205/pico'
dh_auto_build: make -j1 returned exit code 2
make[1]: *** [override_dh_auto_build] Error 2
make[1]: Leaving directory `/build/buildd/svox-1.0+git20100205'
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110826-0509
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/svox-1.0+git20100205