gnunet version 0.8.1b-5build1 failed to build on amd64 with GCC-4.6/oneiric

gnunet version 0.8.1b-5build1 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2451694

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/2451694/+files/buildlog_ubuntu-natty-amd64.gnunet_0.8.1b-5build1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 3014 lines into the build log:

#define HAVE_STRING_H 1
#define HAVE_MEMORY_H 1
#define HAVE_STRINGS_H 1
#define HAVE_INTTYPES_H 1
#define HAVE_STDINT_H 1
#define HAVE_UNISTD_H 1
#define HAVE_DLFCN_H 1
#define LT_OBJDIR ".libs/"

configure: exit 1
dh_auto_configure: ./configure --build=x86_64-linux-gnu --prefix=/usr --includedir=${prefix}/include --mandir=${prefix}/share/man --infodir=${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --libexecdir=${prefix}/lib/gnunet --disable-maintainer-mode --disable-dependency-tracking --disable-rpath --enable-guile --enable-ipv6 --with-microhttpd=yes returned exit code 1
make[1]: *** [override_dh_auto_configure] Error 9
make[1]: Leaving directory `/build/buildd/gnunet-0.8.1b'
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110423-0348
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/gnunet-0.8.1b