nec2c version 0.8-2 failed to build on amd64 with GCC-4.6/oneiric

nec2c version 0.8-2 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2463024

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/2463024/+files/buildlog_ubuntu-natty-amd64.nec2c_0.8-2_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 599 lines into the build log:

somnec.o: In function `evlua':
/build/buildd/nec2c-0.8/somnec.c:403: undefined reference to `cabs'
/build/buildd/nec2c-0.8/somnec.c:352: undefined reference to `sqrtl'
/build/buildd/nec2c-0.8/somnec.c:352: undefined reference to `sqrtl'
somnec.o: In function `somnec':
/build/buildd/nec2c-0.8/somnec.c:59: undefined reference to `csqrtl'
/build/buildd/nec2c-0.8/somnec.c:61: undefined reference to `cabs'
/build/buildd/nec2c-0.8/somnec.c:96: undefined reference to `sincosl'
/build/buildd/nec2c-0.8/somnec.c:104: undefined reference to `sincosl'
/build/buildd/nec2c-0.8/somnec.c:149: undefined reference to `sincosl'
collect2: ld returned 1 exit status
make[1]: *** [nec2c] Error 1
make[1]: Leaving directory `/build/buildd/nec2c-0.8'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110424-2314
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/nec2c-0.8