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diff --git a/test/monniaux/ocaml/byterun/caml/gc.h b/test/monniaux/ocaml/byterun/caml/gc.h
new file mode 100644
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+++ b/test/monniaux/ocaml/byterun/caml/gc.h
@@ -0,0 +1,79 @@
+/**************************************************************************/
+/*                                                                        */
+/*                                 OCaml                                  */
+/*                                                                        */
+/*              Damien Doligez, projet Para, INRIA Rocquencourt           */
+/*                                                                        */
+/*   Copyright 1996 Institut National de Recherche en Informatique et     */
+/*     en Automatique.                                                    */
+/*                                                                        */
+/*   All rights reserved.  This file is distributed under the terms of    */
+/*   the GNU Lesser General Public License version 2.1, with the          */
+/*   special exception on linking described in the file LICENSE.          */
+/*                                                                        */
+/**************************************************************************/
+
+#ifndef CAML_GC_H
+#define CAML_GC_H
+
+
+#include "mlvalues.h"
+
+#define Caml_white (0 << 8)
+#define Caml_gray  (1 << 8)
+#define Caml_blue  (2 << 8)
+#define Caml_black (3 << 8)
+
+#define Color_hd(hd) ((color_t) ((hd) & Caml_black))
+#define Color_hp(hp) (Color_hd (Hd_hp (hp)))
+#define Color_val(val) (Color_hd (Hd_val (val)))
+
+#define Is_white_hd(hd) (Color_hd (hd) == Caml_white)
+#define Is_gray_hd(hd) (Color_hd (hd) == Caml_gray)
+#define Is_blue_hd(hd) (Color_hd (hd) == Caml_blue)
+#define Is_black_hd(hd) (Color_hd (hd) == Caml_black)
+
+#define Whitehd_hd(hd) (((hd)  & ~Caml_black)/*| Caml_white*/)
+#define Grayhd_hd(hd)  (((hd)  & ~Caml_black)  | Caml_gray)
+#define Blackhd_hd(hd) (((hd)/*& ~Caml_black*/)| Caml_black)
+#define Bluehd_hd(hd)  (((hd)  & ~Caml_black)  | Caml_blue)
+
+/* This depends on the layout of the header.  See [mlvalues.h]. */
+#define Make_header(wosize, tag, color)                                       \
+      (/*CAMLassert ((wosize) <= Max_wosize),*/                                   \
+       ((header_t) (((header_t) (wosize) << 10)                               \
+                    + (color)                                                 \
+                    + (tag_t) (tag)))                                         \
+      )
+
+#ifdef WITH_PROFINFO
+#define Make_header_with_profinfo(wosize, tag, color, profinfo)               \
+      (Make_header(wosize, tag, color)                                        \
+        | ((((intnat) profinfo) & PROFINFO_MASK) << PROFINFO_SHIFT)           \
+      )
+#else
+#define Make_header_with_profinfo(wosize, tag, color, profinfo) \
+  Make_header(wosize, tag, color)
+#endif
+
+#ifdef WITH_SPACETIME
+struct ext_table;
+extern uintnat caml_spacetime_my_profinfo(struct ext_table**, uintnat);
+#define Make_header_allocated_here(wosize, tag, color)                        \
+      (Make_header_with_profinfo(wosize, tag, color,                          \
+        caml_spacetime_my_profinfo(NULL, wosize))                             \
+      )
+#else
+#define Make_header_allocated_here Make_header
+#endif
+
+#define Is_white_val(val) (Color_val(val) == Caml_white)
+#define Is_gray_val(val) (Color_val(val) == Caml_gray)
+#define Is_blue_val(val) (Color_val(val) == Caml_blue)
+#define Is_black_val(val) (Color_val(val) == Caml_black)
+
+/* For extern.c */
+#define Colornum_hd(hd) ((color_t) (((hd) >> 8) & 3))
+#define Coloredhd_hd(hd,colnum) (((hd) & ~Caml_black) | ((colnum) << 8))
+
+#endif /* CAML_GC_H */