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diff --git a/guile18/doc/oldfmt.c b/guile18/doc/oldfmt.c
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+/* Copyright (C) 2000,2001, 2006, 2008 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
+ */
+
+
+
+/* From NEWS:
+ * 
+ * * New primitive: `simple-format', affects `scm-error', scm_display_error, & scm_error message strings
+ * 
+ * (ice-9 boot) makes `format' an alias for `simple-format' until possibly
+ * extended by the more sophisticated version in (ice-9 format)
+ * 
+ * (simple-format port message . args)
+ * Write MESSAGE to DESTINATION, defaulting to `current-output-port'.
+ * MESSAGE can contain ~A (was %s) and ~S (was %S) escapes.  When printed,
+ * the escapes are replaced with corresponding members of ARGS:
+ * ~A formats using `display' and ~S formats using `write'.
+ * If DESTINATION is #t, then use the `current-output-port',
+ * if DESTINATION is #f, then return a string containing the formatted text.
+ * Does not add a trailing newline."
+ * 
+ * The two C procedures: scm_display_error and scm_error, as well as the
+ * primitive `scm-error', now use scm_format to do their work.  This means
+ * that the message strings of all code must be updated to use ~A where %s
+ * was used before, and ~S where %S was used before.
+ * 
+ * During the period when there still are a lot of old Guiles out there,
+ * you might want to support both old and new versions of Guile.
+ * 
+ * There are basically two methods to achieve this.  Both methods use
+ * autoconf.  Put
+ * 
+ *   AC_CHECK_FUNCS(scm_simple_format)
+ * 
+ * in your configure.in.
+ * 
+ * Method 1: Use the string concatenation features of ANSI C's
+ *           preprocessor.
+ * 
+ * In C:
+ * 
+ * #ifdef HAVE_SCM_SIMPLE_FORMAT
+ * #define FMT_S "~S"
+ * #else
+ * #define FMT_S "%S"
+ * #endif
+ * 
+ * Then represent each of your error messages using a preprocessor macro:
+ * 
+ * #define E_SPIDER_ERROR "There's a spider in your " ## FMT_S ## "!!!"
+ * 
+ * In Scheme:
+ * 
+ * (define fmt-s (if (defined? 'simple-format) "~S" "%S"))
+ * (define make-message string-append)
+ * 
+ * (define e-spider-error
+ *         (make-message "There's a spider in your " fmt-s "!!!"))
+ * 
+ * Method 2: Use the oldfmt function found in doc/oldfmt.c.
+ * 
+ * In C:
+ * 
+ * scm_misc_error ("picnic", scm_c_oldfmt0 ("There's a spider in your ~S!!!"),
+ *                 ...);
+ * 
+ * In Scheme:
+ * 
+ * (scm-error 'misc-error "picnic" (oldfmt "There's a spider in your ~S!!!")
+ *            ...)
+ * 
+ */
+
+/* 
+ * Take a format string FROM adhering to the new standard format (~A and ~S
+ * as placeholders) of length N and return a string which is adapted
+ * to the format used by the Guile interpreter which you are running.
+ *
+ * On successive calls with similar strings but different storage, the
+ * same string with same storage is returned.  This is necessary since
+ * the existence of a garbage collector in the system may cause the same
+ * format string to be represented with different storage at different
+ * calls.
+ */
+
+char *
+scm_c_oldfmt (char *from, int n)
+{
+#ifdef HAVE_SCM_SIMPLE_FORMAT
+  return from;
+#else
+  static struct { int n; char *from; char *to; } *strings;
+  static int size = 0;
+  static int n_strings = 0;
+  char *to;
+  int i;
+  
+  for (i = 0; i < n_strings; ++i)
+    if (n == strings[i].n && strncmp (from, strings[i].from, n) == 0)
+      return strings[i].to;
+  
+  if (n_strings == size)
+    {
+      if (size == 0)
+	{
+	  size = 10;
+	  strings = scm_must_malloc (size * sizeof (*strings), s_oldfmt);
+	}
+      else
+	{
+	  int oldsize = size;
+	  size = 3 * oldsize / 2;
+	  strings = scm_must_realloc (strings,
+				      oldsize * sizeof (*strings),
+				      size * sizeof (*strings),
+				      s_oldfmt);
+	}
+    }
+
+  strings[n_strings].n = n;
+  strings[n_strings].from = strncpy (scm_must_malloc (n, s_oldfmt), from, n);
+  to = strings[n_strings].to = scm_must_malloc (n + 1, s_oldfmt);
+  n_strings++;
+
+  for (i = 0; i < n; ++i)
+    {
+      if (from[i] == '~' && ++i < n)
+	{
+	  if (from[i] == 'A')
+	    {
+	      to[i - 1] = '%';
+	      to[i] = 's';
+	    }
+	  else if (from[i] == 'S')
+	    {
+	      to[i - 1] = '%';
+	      to[i] = 'S';
+	    }
+	  else
+	    {
+	      to[i - 1] = '~';
+	      to[i] = from[i];
+	    }
+	  continue;
+	}
+      to[i] = from[i];
+    }
+  to[i] = '\0';
+  
+  return to;
+#endif
+}
+
+char *
+scm_c_oldfmt0 (char *s)
+{
+#ifdef HAVE_SCM_SIMPLE_FORMAT
+  return s;
+#else
+  return scm_c_oldfmt (s, strlen (s));
+#endif
+}
+
+SCM_PROC (s_oldfmt, "oldfmt", 1, 0, 0, scm_oldfmt);
+
+SCM
+scm_oldfmt (SCM s)
+{
+#ifdef HAVE_SCM_SIMPLE_FORMAT
+  return s;
+#else
+  int n;
+  SCM_ASSERT (SCM_NIMP (s) && SCM_STRINGP (s), s, 1, s_oldfmt);
+  n = SCM_LENGTH (s);
+  return scm_return_first (scm_mem2string (scm_c_oldfmt (SCM_ROCHARS (s), n),
+					   n),
+			   s);
+#endif
+}