jumpnbump version 1.50+dfsg1-2 failed to build on amd64 with GCC-4.6/oneiric

jumpnbump version 1.50+dfsg1-2 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2454230

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/2454230/+files/buildlog_ubuntu-natty-amd64.jumpnbump_1.50%2Bdfsg1-2_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 948 lines into the build log:

sound.c:(.text+0xaeb): undefined reference to `Mix_PlayingMusic'
sound.c:(.text+0xb00): undefined reference to `Mix_FreeMusic'
sound.c:(.text+0xba5): undefined reference to `Mix_LoadMUS'
sdl.a(sound.o): In function `dj_start_mod':
sound.c:(.text+0xc51): undefined reference to `Mix_VolumeMusic'
sound.c:(.text+0xc62): undefined reference to `Mix_PlayMusic'
sdl.a(sound.o): In function `dj_stop_mod':
sound.c:(.text+0xc81): undefined reference to `Mix_HaltMusic'
sdl.a(sound.o): In function `dj_set_mod_volume':
sound.c:(.text+0xca5): undefined reference to `Mix_VolumeMusic'
collect2: ld returned 1 exit status
make[1]: *** [jumpnbump] Error 1
make[1]: Leaving directory `/build/buildd/jumpnbump-1.50+dfsg1'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110423-2048
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/jumpnbump-1.50+dfsg1