muse version 1.1-0ubuntu3 failed to build on amd64 with GCC-4.6/oneiric

muse version 1.1-0ubuntu3 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2462735

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/2462735/+files/buildlog_ubuntu-natty-amd64.muse_1.1-0ubuntu3_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 2178 lines into the build log:

make[6]: *** [drummap.o] Error 1
make[6]: Leaving directory `/build/buildd/muse-1.1/muse/midiedit'
make[5]: *** [all] Error 2
make[5]: Leaving directory `/build/buildd/muse-1.1/muse/midiedit'
make[4]: *** [all-recursive] Error 1
make[4]: Leaving directory `/build/buildd/muse-1.1/muse'
make[3]: *** [all] Error 2
make[3]: Leaving directory `/build/buildd/muse-1.1/muse'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/muse-1.1'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/muse-1.1'
dh_auto_build: make -j1 returned exit code 2
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110424-2207
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/muse-1.1