monkey-bubble version 0.4.0-0ubuntu7 failed to build on amd64 with GCC-4.6/oneiric

monkey-bubble version 0.4.0-0ubuntu7 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2462365

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/2462365/+files/buildlog_ubuntu-natty-amd64.monkey-bubble_0.4.0-0ubuntu7_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1627 lines into the build log:

gcc -g -O2 -g -O2 -Wl,-Bsymbolic-functions -o monkey-srv main.o -pthread -L/usr/lib/x86_64-linux-gnu /usr/lib/libgtk-x11-2.0.so /usr/lib/libgdk-x11-2.0.so /usr/lib/x86_64-linux-gnu/libatk-1.0.so /usr/lib/x86_64-linux-gnu/libgio-2.0.so /usr/lib/x86_64-linux-gnu/libpangoft2-1.0.so /usr/lib/x86_64-linux-gnu/libpangocairo-1.0.so -lgdk_pixbuf-2.0 -lm /usr/lib/libcairo.so /usr/lib/x86_64-linux-gnu/libpango-1.0.so /usr/lib/x86_64-linux-gnu/libfreetype.so -lfontconfig /usr/lib/x86_64-linux-gnu/libgobject-2.0.so /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so /usr/lib/x86_64-linux-gnu/libgthread-2.0.so -lrt /usr/lib/x86_64-linux-gnu/libglib-2.0.so /usr/lib/libxml2.so libmonkeynet.a ../monkey/libmonkey.a ../util/libmonkeyutil.a
/usr/bin/ld: ../monkey/libmonkey.a(shooter.o): undefined reference to symbol 'rint@@GLIBC_2.2.5'
/usr/bin/ld: note: 'rint@@GLIBC_2.2.5' is defined in DSO /usr/lib/x86_64-linux-gnu/libm.so so try adding it to the linker command line
/usr/lib/x86_64-linux-gnu/libm.so: could not read symbols: Invalid operation
collect2: ld returned 1 exit status
make[4]: *** [monkey-srv] Error 1
make[4]: Leaving directory `/build/buildd/monkey-bubble-0.4.0/src/net'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/build/buildd/monkey-bubble-0.4.0/src'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/monkey-bubble-0.4.0'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/monkey-bubble-0.4.0'
make: *** [debian/stamp-makefile-build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110424-1714
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/monkey-bubble-0.4.0