gosmore version 0.0.0.20100711-1 failed to build on amd64 with GCC-4.6/oneiric

gosmore version 0.0.0.20100711-1 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2451823

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/2451823/+files/buildlog_ubuntu-natty-amd64.gosmore_0.0.0.20100711-1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1474 lines into the build log:

density.c:(.text+0x2c3): undefined reference to `exp'
density.c:(.text+0x2c8): undefined reference to `atan'
density.c:(.text+0x5d3): undefined reference to `exp'
density.c:(.text+0x5d8): undefined reference to `atan'
density.c:(.text+0x67a): undefined reference to `exp'
density.c:(.text+0x67f): undefined reference to `atan'
density.c:(.text+0x723): undefined reference to `exp'
density.c:(.text+0x728): undefined reference to `atan'
density.c:(.text+0x793): undefined reference to `exp'
density.c:(.text+0x798): undefined reference to `atan'
collect2: ld returned 1 exit status
make[1]: *** [bboxes.c] Error 1
make[1]: Leaving directory `/build/buildd/gosmore-0.0.0.20100711'
make: *** [debian/stamp-makefile-build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110423-0523
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/gosmore-0.0.0.20100711