magnus version 20060324-5.2ubuntu1 failed to build on amd64 with GCC-4.6/oneiric

magnus version 20060324-5.2ubuntu1 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2461534

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/2461534/+files/buildlog_ubuntu-natty-amd64.magnus_20060324-5.2ubuntu1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1763 lines into the build log:

g++ -fno-operator-names -D_G_NO_NRV -Wno-deprecated -DHAVE_UNISTD_H -DSAFETY=2 -I../global -Iinclude -I../Map/include -I../Group/include -I../Elt/include -I../libg++/include -c src/Associations.C -o src/obj/Associations.o
In file included from src/Associations.C:14:0:
include/Associations.h: In member function 'void AssociationsRep<Key, Val>::bind(const Key&, const Val&) [with Key = Chars, Val = int]':
src/Associations.C:109:16: instantiated from here
include/Associations.h:153:3: error: using temporary as lvalue [-fpermissive]
make[4]: *** [src/obj/Associations.o] Error 1
make[4]: Leaving directory `/build/buildd/magnus-20060324/back_end/general'
make[3]: *** [libgeneral] Error 2
make[3]: Leaving directory `/build/buildd/magnus-20060324/back_end/SessionManager'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/build/buildd/magnus-20060324/back_end'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/magnus-20060324'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110424-1411
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/magnus-20060324