diff -Naur a/gcc-4.6/libstdc++-v3/include/bits/locale_facets.h b/gcc-4.6/libstdc++-v3/include/bits/locale_facets.h
--- a/gcc-4.6/libstdc++-v3/include/bits/locale_facets.h	2012-03-07 13:20:10.422803306 -0800
+++ b/gcc-4.6/libstdc++-v3/include/bits/locale_facets.h	2012-03-09 14:12:25.004494019 -0800
@@ -1157,7 +1157,20 @@
 
     private:
       void _M_narrow_init() const;
-      void _M_widen_init() const;
+      /* The following member function is moved from src/ctype.cc.
+         See comment there for reason why */
+      void _M_widen_init() const
+      {
+        char __tmp[sizeof(_M_widen)];
+        for (size_t __i = 0; __i < sizeof(_M_widen); ++__i)
+          __tmp[__i] = __i;
+        do_widen(__tmp, __tmp + sizeof(__tmp), _M_widen);
+
+        _M_widen_ok = 1;
+        // Set _M_widen_ok to 2 if memcpy can't be used.
+        if (__builtin_memcmp(__tmp, _M_widen, sizeof(_M_widen)))
+          _M_widen_ok = 2;
+      }
     };
 
 #ifdef _GLIBCXX_USE_WCHAR_T
diff -Naur a/gcc-4.6/libstdc++-v3/src/ctype.cc b/gcc-4.6/libstdc++-v3/src/ctype.cc
--- a/gcc-4.6/libstdc++-v3/src/ctype.cc	2012-03-07 13:20:10.502804305 -0800
+++ b/gcc-4.6/libstdc++-v3/src/ctype.cc	2012-03-09 14:08:12.900648282 -0800
@@ -89,6 +89,20 @@
 	  _M_narrow_ok = 2;
       }
   }
+#if 0
+/*
+  The following member function is moved to header <bits/locale_facets.h>
+  to avoid dependencies on more recent libstdc++.
+  M_widen_init() was moved from <bits/locale_facets.h> to here post gcc 4.2
+  and annotated with version GLIBCXX_3.4.11.  Running code compiled with
+  this GCC 4.6 on Ubuntu 8.04 (where gcc 4.2 is the norm) may result in
+  the following error message:
+
+    ./a.out: /usr/lib32/libstdc++.so.6: version GLIBCXX_3.4.11' not found (required by ./a.out) 
+
+  This workaround is to allow binary generated by this GCC 4.6 to
+  run on older platform.
+*/
 
   void
   ctype<char>::
@@ -104,6 +118,7 @@
     if (__builtin_memcmp(__tmp, _M_widen, sizeof(_M_widen)))
       _M_widen_ok = 2;
   }
+#endif // 0
 
 #ifdef _GLIBCXX_USE_WCHAR_T
   ctype<wchar_t>::ctype(size_t __refs)