rdup version 1.0.5-1ubuntu1 failed to build in oneiric

rdup version 1.0.5-1ubuntu1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2710309

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/2710309/+files/buildlog_ubuntu-oneiric-amd64.rdup_1.0.5-1ubuntu1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 454 lines into the build log:

x86_64-linux-gnu-gcc -Wall -W -Werror -Wall -g -O2 -Wl,-z,defs -DHAVE_CONFIG_H -DLOCALEROOTDIR=\"/usr/share/locale\" -Os -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -Wpointer-arith -Wstrict-prototypes -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -c mkpath.c
x86_64-linux-gnu-gcc -Wall -W -Werror -Wall -g -O2 -Wl,-z,defs -DHAVE_CONFIG_H -DLOCALEROOTDIR=\"/usr/share/locale\" -Os -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -Wpointer-arith -Wstrict-prototypes -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -c dir.c
x86_64-linux-gnu-gcc -Wall -W -Werror -Wall -g -O2 -Wl,-z,defs -DHAVE_CONFIG_H -DLOCALEROOTDIR=\"/usr/share/locale\" -Os -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -Wpointer-arith -Wstrict-prototypes -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -c strippath.c
x86_64-linux-gnu-gcc rdup-up.o entry.o usage-up.o signal.o link.o getdelim.o abspath.o rm.o fs-up.o mkpath.o protocol.o msg.o dir.o strippath.o -lglib-2.0 -lnettle -lpcre -larchive -L/usr/lib/x86_64-linux-gnu -lpcre -o rdup-up
x86_64-linux-gnu-gcc -Wall -W -Werror -Wall -g -O2 -Wl,-z,defs -DHAVE_CONFIG_H -DLOCALEROOTDIR=\"/usr/share/locale\" -Os -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -Wpointer-arith -Wstrict-prototypes -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -c rdup-tr.c
rdup-tr.c: In function 'crypt_entry':
rdup-tr.c:45:30: error: variable 'p' set but not used [-Werror=unused-but-set-variable]
rdup-tr.c: In function 'decrypt_entry':
rdup-tr.c:73:30: error: variable 'p' set but not used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

make[1]: *** [rdup-tr.o] Error 1
make[1]: Leaving directory `/build/buildd/rdup-1.0.5'
make: *** [build-arch-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110823-0649
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/rdup-1.0.5