libmpeg3 version 1.5.4-5 failed to build on amd64 with GCC-4.6/oneiric

libmpeg3 version 1.5.4-5 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2458910

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/2458910/+files/buildlog_ubuntu-natty-amd64.libmpeg3_1.5.4-5_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 469 lines into the build log:

amd64/libmpeg3.so.1.5.4: undefined reference to `a52_block'
amd64/libmpeg3.so.1.5.4: undefined reference to `pthread_mutexattr_init'
amd64/libmpeg3.so.1.5.4: undefined reference to `a52_frame'
amd64/libmpeg3.so.1.5.4: undefined reference to `a52_free'
amd64/libmpeg3.so.1.5.4: undefined reference to `a52_syncinfo'
amd64/libmpeg3.so.1.5.4: undefined reference to `sin'
amd64/libmpeg3.so.1.5.4: undefined reference to `a52_init'
amd64/libmpeg3.so.1.5.4: undefined reference to `pow'
amd64/libmpeg3.so.1.5.4: undefined reference to `cos'
amd64/libmpeg3.so.1.5.4: undefined reference to `pthread_join'
collect2: ld returned 1 exit status
make[1]: *** [amd64/mpeg3dump] Error 1
make[1]: Leaving directory `/build/buildd/libmpeg3-1.5.4'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110424-0609
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/libmpeg3-1.5.4