--- stacks.c.~1.83.2.1.~	2006-02-14 08:59:02.000000000 +1100
+++ stacks.c	2007-03-06 11:21:05.000000000 +1100
@@ -1,5 +1,5 @@
 /* Representation of stack frame debug information
- * Copyright (C) 1996,1997,2000,2001, 2006 Free Software Foundation
+ * Copyright (C) 1996,1997,2000,2001, 2006, 2007 Free Software Foundation
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -740,14 +740,10 @@
 void
 scm_init_stacks ()
 {
-  SCM vtable;
-  SCM stack_layout
-    = scm_make_struct_layout (scm_from_locale_string (SCM_STACK_LAYOUT));
-  vtable = scm_make_vtable_vtable (scm_nullstr, SCM_INUM0, SCM_EOL);
-  scm_stack_type
-    = scm_permanent_object (scm_make_struct (vtable, SCM_INUM0,
-					     scm_cons (stack_layout,
-						       SCM_EOL)));
+  scm_stack_type =
+    scm_permanent_object
+    (scm_make_vtable (scm_from_locale_string (SCM_STACK_LAYOUT),
+                      SCM_UNDEFINED));
   scm_set_struct_vtable_name_x (scm_stack_type,
 				scm_from_locale_symbol ("stack"));
 #include "libguile/stacks.x"