[head tinderbox] failure on sparc64/sparc64

[FreeBSD Tinderbox]

TB --- 2006-09-30 11:41:50 - tinderbox 2.3 running on freebsd-current.sentex.ca
TB --- 2006-09-30 11:41:50 - starting HEAD tinderbox run for sparc64/sparc64
TB --- 2006-09-30 11:41:50 - cleaning the object tree
TB --- 2006-09-30 11:42:23 - checking out the source tree
TB --- 2006-09-30 11:42:23 - cd /tinderbox/HEAD/sparc64/sparc64
TB --- 2006-09-30 11:42:23 - /usr/bin/cvs -f -R -q -d/home/ncvs update -Pd -A src
TB --- 2006-09-30 11:48:50 - building world (CFLAGS=-O2 -pipe)
TB --- 2006-09-30 11:48:50 - cd /src
TB --- 2006-09-30 11:48:50 - /usr/bin/make -B buildworld
>>> World build started on Sat Sep 30 11:48:51 UTC 2006
>>> 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
[...]
===> gnu/lib/libregex/doc (buildincludes)
===> gnu/lib/libreadline (buildincludes)
===> gnu/lib/libreadline/history (buildincludes)
===> gnu/lib/libreadline/history/doc (buildincludes)
===> gnu/lib/libreadline/readline (buildincludes)
===> gnu/lib/libreadline/readline/doc (buildincludes)
===> gnu/lib/libstdc++ (buildincludes)
make: don't know how to make /src/gnu/lib/libstdc++/../../../contrib/libstdc++/include/ext/demangle.h. Stop
*** Error code 2

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

Stop in /src/gnu.
*** Error code 1

Stop in /src/gnu.
*** Error code 1

Stop in /src.
*** Error code 1

Stop in /src.
*** Error code 1

Stop in /src.
TB --- 2006-09-30 11:57:32 - WARNING: /usr/bin/make returned exit code  1 
TB --- 2006-09-30 11:57:32 - ERROR: failed to build world
TB --- 2006-09-30 11:57:32 - tinderbox aborted
TB --- 1.06 user 5.28 system 942.01 real