[head tinderbox] failure on amd64/amd64

[FreeBSD Tinderbox]

TB --- 2011-11-25 23:50:00 - tinderbox 2.8 running on freebsd-current.sentex.ca
TB --- 2011-11-25 23:50:00 - starting HEAD tinderbox run for amd64/amd64
TB --- 2011-11-25 23:50:00 - cleaning the object tree
TB --- 2011-11-25 23:50:44 - cvsupping the source tree
TB --- 2011-11-25 23:50:44 - /usr/bin/csup -z -r 3 -g -L 1 -h cvsup.sentex.ca /tinderbox/HEAD/amd64/amd64/supfile
TB --- 2011-11-25 23:50:58 - building world
TB --- 2011-11-25 23:50:58 - CROSS_BUILD_TESTING=YES
TB --- 2011-11-25 23:50:58 - MAKEOBJDIRPREFIX=/obj
TB --- 2011-11-25 23:50:58 - PATH=/usr/bin:/usr/sbin:/bin:/sbin
TB --- 2011-11-25 23:50:58 - SRCCONF=/dev/null
TB --- 2011-11-25 23:50:58 - TARGET=amd64
TB --- 2011-11-25 23:50:58 - TARGET_ARCH=amd64
TB --- 2011-11-25 23:50:58 - TZ=UTC
TB --- 2011-11-25 23:50:58 - __MAKE_CONF=/dev/null
TB --- 2011-11-25 23:50:58 - cd /src
TB --- 2011-11-25 23:50:58 - /usr/bin/make -B buildworld
>>> World build started on Fri Nov 25 23:50:59 UTC 2011
>>> Rebuilding the temporary build tree
>>> stage 1.1: legacy release compatibility shims
>>> stage 1.2: bootstrap tools
>>> stage 2.1: cleaning up the object tree
>>> stage 2.2: rebuilding the object tree
>>> stage 2.3: build tools
>>> stage 3: cross tools
>>> stage 4.1: building includes
>>> stage 4.2: building libraries
[...]
c++ -fpic -DPIC  -O2 -pipe -I/src/lib/libcxxrt/../../contrib/libcxxrt -fstack-protector -c /src/lib/libcxxrt/../../contrib/libcxxrt/memory.cc -o memory.So
c++ -fpic -DPIC  -O2 -pipe -I/src/lib/libcxxrt/../../contrib/libcxxrt -fstack-protector -c /src/lib/libcxxrt/../../contrib/libcxxrt/auxhelper.cc -o auxhelper.So
c++ -fpic -DPIC  -O2 -pipe -I/src/lib/libcxxrt/../../contrib/libcxxrt -fstack-protector -c /src/lib/libcxxrt/../../contrib/libcxxrt/exception.cc -o exception.So
c++ -fpic -DPIC  -O2 -pipe -I/src/lib/libcxxrt/../../contrib/libcxxrt -fstack-protector -c /src/lib/libcxxrt/../../contrib/libcxxrt/stdexcept.cc -o stdexcept.So
c++ -fpic -DPIC  -O2 -pipe -I/src/lib/libcxxrt/../../contrib/libcxxrt -fstack-protector -c /src/lib/libcxxrt/../../contrib/libcxxrt/typeinfo.cc -o typeinfo.So
c++ -fpic -DPIC  -O2 -pipe -I/src/lib/libcxxrt/../../contrib/libcxxrt -fstack-protector -c /src/lib/libcxxrt/../../contrib/libcxxrt/guard.cc -o guard.So
building shared library libcxxrt.so.1
/obj/amd64.amd64/src/tmp/usr/bin/ld: cannot find -lpthread
*** Error code 1

Stop in /src/lib/libcxxrt.
*** Error code 1

Stop in /src.
*** Error code 1

Stop in /src.
*** Error code 1

Stop in /src.
*** Error code 1

Stop in /src.
TB --- 2011-11-26 00:07:49 - WARNING: /usr/bin/make returned exit code  1 
TB --- 2011-11-26 00:07:49 - ERROR: failed to build world
TB --- 2011-11-26 00:07:49 - 806.98 user 167.70 system 1068.23 real


http://tinderbox.freebsd.org/tinderbox-head-HEAD-amd64-amd64.full