gnustep-gui version 0.18.0-5 failed to build on amd64 with GCC-4.6/oneiric

gnustep-gui version 0.18.0-5 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2451739

Details about the rebuild:
https://lists.ubuntu.com/archives/ubuntu-devel/2011-April/033042.html

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2451739/+files/buildlog_ubuntu-natty-amd64.gnustep-gui_0.18.0-5_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 2143 lines into the build log:

 if ././obj/make_services --test GSspell.service/Resources/Info-gnustep.plist; then : ; else rm -f GSspell.service/Resources/Info-gnustep.plist; false; \
 fi

Session terminated, terminating shell... ...terminated.
make[4]: *** Deleting file `GSspell.service/Resources/Info-gnustep.plist'
make[1]: *** wait: No child processes. Stop.
make[1]: *** Waiting for unfinished jobs....
make[1]: *** wait: No child processes. Stop.
make: *** wait: No child processes. Stop.
make: *** Waiting for unfinished jobs....
make: *** wait: No child processes. Stop.
make[2]: *** [internal-all] Terminated
make[3]: *** [GSspell.all.service.variables] Terminated
make[4]: *** [GSspell.service/Resources/Info-gnustep.plist] Terminated
Build killed with signal 15 after 150 minutes of inactivity
******************************************************************************
Build finished at 20110423-0635
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/gnustep-gui-0.18.0