oggfwd version 0.2-5 failed to build on amd64 with GCC-4.6/oneiric

oggfwd version 0.2-5 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2463788

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/2463788/+files/buildlog_ubuntu-natty-amd64.oggfwd_0.2-5_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 389 lines into the build log:

/build/buildd/oggfwd-0.2/oggfwd.c:230: undefined reference to `shout_sync'
/build/buildd/oggfwd-0.2/oggfwd.c:209: undefined reference to `shout_send'
/build/buildd/oggfwd-0.2/oggfwd.c:211: undefined reference to `shout_get_error'
/build/buildd/oggfwd-0.2/oggfwd.c:163: undefined reference to `shout_get_error'
/build/buildd/oggfwd-0.2/oggfwd.c:153: undefined reference to `shout_get_error'
/build/buildd/oggfwd-0.2/oggfwd.c:169: undefined reference to `shout_get_error'
/build/buildd/oggfwd-0.2/oggfwd.c:175: undefined reference to `shout_get_error'
/build/buildd/oggfwd-0.2/oggfwd.c:238: undefined reference to `shout_close'
/build/buildd/oggfwd-0.2/oggfwd.c:233: undefined reference to `shout_get_error'
collect2: ld returned 1 exit status
make[1]: *** [oggfwd] Error 1
make[1]: Leaving directory `/build/buildd/oggfwd-0.2'
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 20110425-0552
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/oggfwd-0.2