espeakup version 1:0.71-2 failed to build in oneiric

espeakup version 1:0.71-2 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2692453

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/2692453/+files/buildlog_ubuntu-oneiric-amd64.espeakup_1%3A0.71-2_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 308 lines into the build log:

queue.c: In function 'queue_process_entry':
queue.c:135:15: warning: variable 'error' set but not used [-Wunused-but-set-variable]
cc -c -Wall -g -O2 -Os -o softsynth.o softsynth.c
softsynth.c: In function 'process_buffer.isra.1':
softsynth.c:98:16: warning: 'adj' may be used uninitialized in this function [-Wuninitialized]
softsynth.c:42:16: note: 'adj' was declared here
softsynth.c:98:16: warning: 'value' may be used uninitialized in this function [-Wuninitialized]
softsynth.c:41:6: note: 'value' was declared here
cc -c -Wall -g -O2 -Os -o synth.o synth.c
cc -u _Unwind_Resume -u __gcc_personality_v0 -u _Unwind_ForcedUnwind -u _Unwind_GetCFA -u _Unwind_GetBSP -lgcc_s espeakup.o cli.o queue.o softsynth.o synth.o /usr/lib/libespeak.a /usr/lib/libportaudio.a /usr/lib/libjack.a -lm -lpthread -lasound -lrt -o espeakup
cc: error: /usr/lib/libjack.a: No such file or directory
make[1]: *** [espeakup] Error 1
make[1]: Leaving directory `/build/buildd/espeakup-0.71/espeakup-udeb'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110820-0943
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/espeakup-0.71