adept version 3.0~beta7.2+nmu1ubuntu2 failed to build in oneiric

adept version 3.0~beta7.2+nmu1ubuntu2 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2688119

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/2688119/+files/buildlog_ubuntu-oneiric-amd64.adept_3.0%7Ebeta7.2%2Bnmu1ubuntu2_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1478 lines into the build log:

cd "/build/buildd/adept-3.0~beta7.2+nmu1ubuntu2/obj-x86_64-linux-gnu/ept" && /usr/bin/cmake -E cmake_link_script CMakeFiles/ept-test.dir/link.txt --verbose=1
/usr/bin/g++ -g -O2 -g -O2 -Wall -Wnon-virtual-dtor -Wno-long-long -ansi -Wundef -Wcast-align -Wchar-subscripts -Wall -W -Wpointer-arith -Wformat-security -fno-exceptions -DQT_NO_EXCEPTIONS -fno-check-new -fno-common -Woverloaded-virtual -fno-threadsafe-statics -fvisibility=hidden -Werror=return-type -fvisibility-inlines-hidden -fexceptions -O2 -g -DNDEBUG -DQT_NO_DEBUG -Wl,--enable-new-dtags -Wl,-Bsymbolic-functions "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_core_list.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_core_xapian.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_core_desktop.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_core_apt.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_core_apt_action.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_core_apt_record.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_core_predicate_predicate.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_core_predicate_combinators.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_debtags_tag.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_debtags_vocabulary.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_debtags_expression.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_debtags_debtags.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_debtags_maint_vocabularymerger.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_debtags_maint_pkgid.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_debtags_maint_serializer.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_popcon_popcon.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_popcon_local.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_apt_packagerecord.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_apt_recordparser.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_apt_version.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_apt_apt.o" "CMakeFiles/ept-test.dir/ept-test-generated-_build_buildd_adept-3.0~beta7.2+nmu1ubuntu2_ept_textsearch_textsearch.o" CMakeFiles/ept-test.dir/ept-test-generated-main.o -o ept-test -rdynamic -L"/build/buildd/adept-3.0~beta7.2+nmu1ubuntu2/obj-x86_64-linux-gnu/ept/../lib" -L"/build/buildd/adept-3.0~beta7.2+nmu1ubuntu2/obj-x86_64-linux-gnu/lib" -lwibble -ltagcoll2 -lz -lwibble -lapt-pkg -lxapian ../lib/libept.a -lwibble -ltagcoll2 -lz -lwibble -ltagcoll2 -lz -lapt-pkg -lxapian
CMakeFiles/ept-test.dir/ept-test-generated-main.o: In function `Mutex':
/usr/include/wibble/sys/mutex.h:69: undefined reference to `pthread_mutexattr_init'
/usr/include/wibble/sys/mutex.h:69: undefined reference to `pthread_mutexattr_init'
/usr/include/wibble/sys/mutex.h:69: undefined reference to `pthread_mutexattr_init'
collect2: ld returned 1 exit status
make[3]: *** [ept/ept-test] Error 1
make[3]: Leaving directory `/build/buildd/adept-3.0~beta7.2+nmu1ubuntu2/obj-x86_64-linux-gnu'
make[2]: *** [ept/CMakeFiles/ept-test.dir/all] Error 2
make[2]: Leaving directory `/build/buildd/adept-3.0~beta7.2+nmu1ubuntu2/obj-x86_64-linux-gnu'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/adept-3.0~beta7.2+nmu1ubuntu2/obj-x86_64-linux-gnu'
make: *** [debian/stamp-makefile-build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110819-1702
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/adept-3.0~beta7.2+nmu1ubuntu2