genus2reduction version 0.3-2ubuntu1 failed to build in oneiric

genus2reduction version 0.3-2ubuntu1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2693873

Details about the rebuild:
http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20110816-oneiric.html

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2693873/+files/buildlog_ubuntu-oneiric-amd64.genus2reduction_0.3-2ubuntu1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 476 lines into the build log:

genus2reduction.c:1939:34: error: 'polx' undeclared (first use in this function)
genus2reduction.c:1942:69: error: 'gi' undeclared (first use in this function)
genus2reduction.c:1928:23: warning: variable 'unmodp' set but not used [-Wunused-but-set-variable]
genus2reduction.c: In function 'zi2mod':
genus2reduction.c:2001:19: error: 'gi' undeclared (first use in this function)
genus2reduction.c: In function 'factmz':
genus2reduction.c:2023:6: warning: implicit declaration of function 'max' [-Wimplicit-function-declaration]
genus2reduction.c:2046:2: warning: label 'sort' defined but not used [-Wunused-label]
genus2reduction.c: In function 'main':
genus2reduction.c:96:8: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
genus2reduction.c:98:8: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
make[1]: *** [genus2reduction] Error 1
make[1]: Leaving directory `/build/buildd/genus2reduction-0.3'
make: *** [debian/stamp-makefile-build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110820-1909
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/genus2reduction-0.3