slidentd version 1.0.0-6.1ubuntu1 failed to build in oneiric

slidentd version 1.0.0-6.1ubuntu1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2711628

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/2711628/+files/buildlog_ubuntu-oneiric-amd64.slidentd_1.0.0-6.1ubuntu1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 259 lines into the build log:

diet -Os cc -pipe -Wall -Os -fomit-frame-pointer -DNDEBUG -static -c -o slid_read.o slid_read.c
diet -Os cc -pipe -Wall -Os -fomit-frame-pointer -DNDEBUG -static -c -o slid_remote_info.o slid_remote_info.c
diet -Os cc -pipe -Wall -Os -fomit-frame-pointer -DNDEBUG -static -c -o slid_setuid.o slid_setuid.c
diet -Os cc -pipe -Wall -Os -fomit-frame-pointer -DNDEBUG -static -c -o slid_tcptable.o slid_tcptable.c
diet -Os cc -pipe -Wall -Os -fomit-frame-pointer -DNDEBUG -static -c -o slidentd.o slidentd.c
diet -Os cc -pipe -Wall -Os -fomit-frame-pointer -DNDEBUG -static -c -o honest_identd.o honest_identd.c
strip -x -R .comment -R .note slid_chroot.o slid_datestamp.o slid_die.o slid_fmt_xlong0.o slid_get_input.o slid_log.o slid_random.o slid_read.o slid_remote_info.o slid_setuid.o slid_tcptable.o slidentd.o honest_identd.o
diet -Os cc slid_chroot.o slid_datestamp.o slid_die.o slid_fmt_xlong0.o slid_get_input.o slid_log.o slid_random.o slid_read.o slid_remote_info.o slid_setuid.o slid_tcptable.o -o slidentd slidentd.o -lowfat
/usr/lib64/libowfat.a(scan_whitenskip.o): In function `scan_whitenskip':
(.text+0x15): undefined reference to `__ctype_b_loc'
collect2: ld returned 1 exit status
make[1]: *** [slidentd] Error 1
make[1]: Leaving directory `/build/buildd/slidentd-1.0.0'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110819-0933
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/slidentd-1.0.0