simgrid version 3.6.1-2 failed to build in oneiric

simgrid version 3.6.1-2 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+source/simgrid/3.6.1-2/+build/2650838

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/+source/simgrid/3.6.1-2/+build/2650838/+files/buildlog_ubuntu-oneiric-amd64.simgrid_3.6.1-2_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 634 lines into the build log:

-- Check size of void*
-- Check size of void* - done
CMake Error at buildtools/Cmake/CompleteInFiles.cmake:246 (message):
  Semaphores are not usable, but they are mandatory to threads (you may need
  to mount /dev).
Call Stack (most recent call first):
  CMakeLists.txt:204 (include)

-- Configuring incomplete, errors occurred!
dh_auto_configure: cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_VERBOSE_MAKEFILE=ON -Dprefix=/usr returned exit code 1
make[1]: *** [override_dh_auto_configure] Error 2
make[1]: Leaving directory `/build/buildd/simgrid-3.6.1'
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110728-0457
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/simgrid-3.6.1