ace version 5.7.7-4 failed to build on i386 and armel

ace version 5.7.7-4 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2387745

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2387745/+files/buildlog_ubuntu-natty-i386.ace_5.7.7-4_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 2522 lines into the build log:

touch .depend.gperf
make[2]: Leaving directory `/build/buildd/ace-5.7.7/ACE_wrappers/apps/gperf/src'
ls: cannot access /usr/lib*/librt.so*: No such file or directory
ls: cannot access /lib*/librt.so*: No such file or directory
make[2]: Entering directory `/build/buildd/ace-5.7.7/ACE_wrappers/apps/gperf/src'

GNUmakefile: /build/buildd/ace-5.7.7/ACE_wrappers/apps/gperf/src/GNUmakefile.gperf MAKEFLAGS=w -- versioned_so=2

g++ -fvisibility=hidden -fvisibility-inlines-hidden -W -Wall -Wpointer-arith -O3 -pipe -D_REENTRANT -D_GNU_SOURCE -DNDEBUG -I/build/buildd/ace-5.7.7/ACE_wrappers -DACE_NDEBUG -DACE_USE_RCSID=0 -DACE_HAS_EXCEPTIONS -D__ACE_INLINE__ -I/build/buildd/ace-5.7.7/ACE_wrappers -DACE_HAS_IPV6 -c -o .obj/gperf.o gperf.cpp
ls: cannot access /usr/lib*/librt.so*: No such file or directory
ls: cannot access /lib*/librt.so*: No such file or directory
g++ -fvisibility=hidden -fvisibility-inlines-hidden -W -Wall -Wpointer-arith -O3 -pipe -D_REENTRANT -D_GNU_SOURCE -DNDEBUG -I/build/buildd/ace-5.7.7/ACE_wrappers -DACE_NDEBUG -DACE_USE_RCSID=0 -DACE_HAS_EXCEPTIONS -D__ACE_INLINE__ -I/build/buildd/ace-5.7.7/ACE_wrappers -DACE_HAS_IPV6 -Wl,-Bsymbolic-functions -Wl,-E -L/build/buildd/ace-5.7.7/ACE_wrappers/lib -L. -L./ -L/build/buildd/ace-5.7.7/ACE_wrappers/lib -L/build/buildd/ace-5.7.7/ACE_wrappers/lib/ -o ace_gperf .obj/gperf.o -lACE_gperf_lib -lACE -ldl -lpthread
/build/buildd/ace-5.7.7/ACE_wrappers/lib/libACE.so: undefined reference to `aio_suspend'
/build/buildd/ace-5.7.7/ACE_wrappers/lib/libACE.so: undefined reference to `aio_read'
/build/buildd/ace-5.7.7/ACE_wrappers/lib/libACE.so: undefined reference to `aio_error'
/build/buildd/ace-5.7.7/ACE_wrappers/lib/libACE.so: undefined reference to `aio_return'
/build/buildd/ace-5.7.7/ACE_wrappers/lib/libACE.so: undefined reference to `aio_cancel'
/build/buildd/ace-5.7.7/ACE_wrappers/lib/libACE.so: undefined reference to `aio_write'
collect2: ld returned 1 exit status
make[2]: *** [ace_gperf] Error 1
make[2]: Leaving directory `/build/buildd/ace-5.7.7/ACE_wrappers/apps/gperf/src'
make[1]: *** [gperf] Error 2
make[1]: Leaving directory `/build/buildd/ace-5.7.7/ACE_wrappers'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110403-1028
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/ace-5.7.7