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diff --git a/guile18/libguile/struct.h b/guile18/libguile/struct.h
new file mode 100644
index 0000000000..4b263d2e5c
--- /dev/null
+++ b/guile18/libguile/struct.h
@@ -0,0 +1,117 @@
+/* classes: h_files */
+
+#ifndef SCM_STRUCT_H
+#define SCM_STRUCT_H
+
+/* Copyright (C) 1995,1997,1999,2000,2001, 2006, 2007 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+
+#include "libguile/__scm.h"
+#include "libguile/print.h"
+
+
+
+/* Number of words with negative index */
+#define scm_struct_n_extra_words 4
+#define scm_struct_entity_n_extra_words 6
+
+/* These are how the initial words of a vtable are allocated. */
+#define scm_struct_i_setter	-6 /* Setter */
+#define scm_struct_i_procedure	-5 /* Optional procedure slot */
+#define scm_struct_i_free	-4 /* Destructor */
+#define scm_struct_i_ptr	-3 /* Start of block (see alloc_struct) */
+#define scm_struct_i_n_words	-2 /* How many words allocated to this struct? */
+#define scm_struct_i_size	-1 /* Instance size */
+#define scm_struct_i_flags	-1 /* Upper 12 bits used as flags */
+
+/* These indices must correspond to required_vtable_fields in
+   struct.c. */
+#define scm_vtable_index_layout  0 /* A symbol describing the physical arrangement of this type. */
+#define scm_vtable_index_vtable  1 /* A pointer to the handle for this vtable. */
+#define scm_vtable_index_printer 2 /* A printer for this struct type. */
+#define scm_vtable_offset_user   3 /* Where do user fields start? */
+
+typedef void (*scm_t_struct_free) (scm_t_bits * vtable, scm_t_bits * data);
+
+#define SCM_STRUCTF_MASK   (0xFFF << 20)
+#define SCM_STRUCTF_ENTITY (1L << 30) /* Indicates presence of proc slots */
+#define SCM_STRUCTF_LIGHT  (1L << 31) /* Light representation
+					 (no hidden words) */
+
+#define SCM_STRUCTP(X)  		(!SCM_IMP(X) && (SCM_TYP3(X) == scm_tc3_struct))
+#define SCM_STRUCT_DATA(X) 		((scm_t_bits *) SCM_CELL_WORD_1 (X))
+#define SCM_STRUCT_VTABLE_DATA(X)       ((scm_t_bits *) (SCM_CELL_WORD_0 (X) - scm_tc3_struct))
+
+#define SCM_STRUCT_LAYOUT(X) 	        (SCM_PACK (SCM_STRUCT_VTABLE_DATA (X) [scm_vtable_index_layout]))
+#define SCM_SET_STRUCT_LAYOUT(X, v)     (SCM_STRUCT_VTABLE_DATA (X) [scm_vtable_index_layout] = SCM_UNPACK (v))
+
+#define SCM_STRUCT_VTABLE(X) 	        (SCM_PACK (SCM_STRUCT_VTABLE_DATA (X) [scm_vtable_index_vtable]))
+#define SCM_STRUCT_VTABLE_FLAGS(X) \
+  (SCM_STRUCT_VTABLE_DATA (X) [scm_struct_i_flags])
+#define SCM_STRUCT_PRINTER(X) 	        (SCM_PACK (SCM_STRUCT_VTABLE_DATA (X) [scm_vtable_index_printer]))
+#define SCM_SET_STRUCT_PRINTER(x, v)\
+   (SCM_STRUCT_VTABLE_DATA (x) [scm_vtable_index_printer] = SCM_UNPACK (v))
+#define SCM_SET_VTABLE_DESTRUCTOR(X, D) (SCM_STRUCT_DATA (X) [scm_struct_i_free] = (scm_t_bits) (D))
+/* Efficiency is important in the following macro, since it's used in GC */
+#define SCM_LAYOUT_TAILP(X)		(((X) & 32) == 0) /* R, W or O */
+
+#define SCM_STRUCT_TABLE_NAME(X) SCM_CAR (X)
+#define SCM_SET_STRUCT_TABLE_NAME(X, NAME) SCM_SETCAR (X, NAME)
+#define SCM_STRUCT_TABLE_CLASS(X) SCM_CDR (X)
+#define SCM_SET_STRUCT_TABLE_CLASS(X, CLASS) SCM_SETCDR (X, CLASS)
+SCM_API SCM scm_struct_table;
+
+#define SCM_STRUCT_GC_CHAIN(X) SCM_CELL_OBJECT_3 (X)
+#define SCM_SET_STRUCT_GC_CHAIN(X, Y) SCM_SET_CELL_OBJECT_3 (X, Y)
+SCM_API SCM scm_i_structs_to_free;
+
+
+
+SCM_API scm_t_bits * scm_alloc_struct (int n_words, int n_extra,
+				       const char *what);
+SCM_API void scm_struct_free_0 (scm_t_bits * vtable, scm_t_bits * data);
+SCM_API void scm_struct_free_light (scm_t_bits * vtable, scm_t_bits * data);
+SCM_API void scm_struct_free_standard (scm_t_bits * vtable, scm_t_bits * data);
+SCM_API void scm_struct_free_entity (scm_t_bits * vtable, scm_t_bits * data);
+SCM_API SCM scm_make_struct_layout (SCM fields);
+SCM_API SCM scm_struct_p (SCM x);
+SCM_API SCM scm_struct_vtable_p (SCM x);
+SCM_API SCM scm_make_struct (SCM vtable, SCM tail_array_size, SCM init);
+SCM_API SCM scm_make_vtable (SCM fields, SCM printer);
+SCM_API SCM scm_make_vtable_vtable (SCM extra_fields, SCM tail_array_size, SCM init);
+SCM_API SCM scm_i_struct_equalp (SCM s1, SCM s2);
+SCM_API SCM scm_struct_ref (SCM handle, SCM pos);
+SCM_API SCM scm_struct_set_x (SCM handle, SCM pos, SCM val);
+SCM_API SCM scm_struct_vtable (SCM handle);
+SCM_API SCM scm_struct_vtable_tag (SCM handle);
+SCM_API unsigned long scm_struct_ihashq (SCM obj, unsigned long n);
+SCM_API SCM scm_struct_create_handle (SCM obj);
+SCM_API SCM scm_struct_vtable_name (SCM vtable);
+SCM_API SCM scm_set_struct_vtable_name_x (SCM vtable, SCM name);
+SCM_API void scm_print_struct (SCM exp, SCM port, scm_print_state *);
+SCM_API void scm_struct_prehistory (void);
+SCM_API void scm_init_struct (void);
+
+#endif  /* SCM_STRUCT_H */
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/