libstdc++ build problem

While updating a system using the 200705 current snapshot to the latest 
current, libstdc++ fails to compile.

What's the trick to updating current to post gcc 4.2?

cc -fpic -DPIC -O2 -fno-strict-aliasing -pipe  -DIN_GLIBCPP_V3 -DHAVE_CONFIG_H -I/usr/src/gnu
/lib/libstdc++ -I/usr/src/gnu/lib/libstdc++/../../../contrib/libstdc++/libsupc++ -I/usr/src/g
nu/lib/libstdc++/../../../contrib/gcc -I/usr/src/gnu/lib/libstdc++/../../../contrib/libstdc++
/include -I/usr/src/gnu/lib/libstdc++/../../../contrib/gcclibs/include -I/usr/src/gnu/lib/lib
stdc++/../../../contrib/libstdc++/include -I. -frandom-seed=RepeatabilityConsideredGood  -c /
usr/src/gnu/lib/libstdc++/../../../contrib/gcclibs/libiberty/cp-demangle.c -o 
cp-demangle.So
building shared library libstdc++.so.6
/usr/obj/usr/src/tmp/usr/bin/ld: libstdc++.so.6: undefined versioned symbol 
name _ZN10__gnu_n
orm15_List_node_base8transferEPS0_S1__at__at_GLIBCXX_3.4
/usr/obj/usr/src/tmp/usr/bin/ld: failed to set dynamic section sizes: Bad 
value
*** Error code 1

Stop in /usr/src/gnu/lib/libstdc++.
*** Error code 1