Index: boehm-gc/win32_threads.c
===================================================================
--- boehm-gc/win32_threads.c	(revision 125636)
+++ boehm-gc/win32_threads.c	(working copy)
@@ -337,6 +337,11 @@
     }
 # endif
 
+GC_PTR GC_get_thread_stack_base()
+{
+  return 0;
+}
+
 void GC_push_all_stacks()
 {
   DWORD thread_id = GetCurrentThreadId();