talksoup.app version 1.0alpha-32-g55b4d4e-1.1build2 failed to build in oneiric

talksoup.app version 1.0alpha-32-g55b4d4e-1.1build2 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+source/talksoup.app/1.0alpha-32-g55b4d4e-1.1build2/+build/2620156

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/+source/talksoup.app/1.0alpha-32-g55b4d4e-1.1build2/+build/2620156/+files/buildlog_ubuntu-oneiric-amd64.talksoup.app_1.0alpha-32-g55b4d4e-1.1build2_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1286 lines into the build log:

 Compiling file Misc/NSColorAdditions.m ...
 Compiling file Misc/NSObjectAdditions.m ...
Misc/NSObjectAdditions.m: In function '+[NSObject(Introspection) methodsDefinedForClass]':
Misc/NSObjectAdditions.m:50:53: error: dereferencing pointer to incomplete type
Misc/NSObjectAdditions.m:53:11: error: dereferencing pointer to incomplete type
Misc/NSObjectAdditions.m:56:14: error: dereferencing pointer to incomplete type
make[6]: *** [obj/GNUstepOutput.obj/Misc/NSObjectAdditions.m.o] Error 1
make[5]: *** [internal-bundle-run-compile-submake] Error 2
make[4]: *** [GNUstepOutput.all.bundle.variables] Error 2
make[3]: *** [internal-all] Error 2
make[2]: *** [internal-all] Error 2
make[1]: *** [internal-all] Error 2
make[1]: Leaving directory `/build/buildd/talksoup.app-1.0alpha-32-g55b4d4e'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110711-1113
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/talksoup.app-1.0alpha-32-g55b4d4e