tcptrack version 1.4.0-1 failed to build in oneiric

tcptrack version 1.4.0-1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2712759

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/2712759/+files/buildlog_ubuntu-oneiric-amd64.tcptrack_1.4.0-1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 429 lines into the build log:

g++ -DHAVE_CONFIG_H -I. -I. -I.. -Werror -Wno-deprecated -Wall -g -O2 -c -o TCContainer.o `test -f 'TCContainer.cc' || echo './'`TCContainer.cc
g++ -DHAVE_CONFIG_H -I. -I. -I.. -Werror -Wno-deprecated -Wall -g -O2 -c -o TextUI.o `test -f 'TextUI.cc' || echo './'`TextUI.cc
TextUI.cc: In member function 'void TextUI::displayer_run()':
TextUI.cc:123:18: error: variable 't' set but not used [-Werror=unused-but-set-variable]
cc1plus: all warnings being treated as errors

make[3]: *** [TextUI.o] Error 1
make[3]: Leaving directory `/build/buildd/tcptrack-1.4.0/src'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/tcptrack-1.4.0'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/tcptrack-1.4.0'
dh_auto_build: make -j1 returned exit code 2
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110824-0000
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/tcptrack-1.4.0