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diff --git a/guile18/libguile/putenv.c b/guile18/libguile/putenv.c
new file mode 100644
index 0000000000..0ff33592ab
--- /dev/null
+++ b/guile18/libguile/putenv.c
@@ -0,0 +1,126 @@
+/* Copyright (C) 1991, 2000, 2001, 2004, 2005, 2006 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
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "libguile/scmconfig.h"
+
+#include <sys/types.h>
+#include <errno.h>
+
+/* Don't include stdlib.h for non-GNU C libraries because some of them
+   contain conflicting prototypes for getopt.
+   This needs to come after some library #include
+   to get __GNU_LIBRARY__ defined.  */
+#ifdef	__GNU_LIBRARY__
+#include <stdlib.h>
+#else
+char *malloc ();
+#endif	/* GNU C library.  */
+
+#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
+#include <string.h>
+#else
+#include <strings.h>
+#ifndef strchr
+#define strchr index
+#endif
+#ifndef memcpy
+#define memcpy(d, s, n) bcopy((s), (d), (n))
+#endif
+#endif
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#if HAVE_CRT_EXTERNS_H
+#include <crt_externs.h>  /* for Darwin _NSGetEnviron */
+#endif
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+extern char **environ;
+
+/* On Apple Darwin in a shared library there's no "environ" to access
+   directly, instead the address of that variable must be obtained with
+   _NSGetEnviron().  */
+#if HAVE__NSGETENVIRON && defined (PIC)
+#define environ (*_NSGetEnviron())
+#endif
+
+/* Put STRING, which is of the form "NAME=VALUE", in the environment.  */
+int
+putenv (const char *string)
+{
+  char *name_end = strchr (string, '=');
+  register size_t size;
+  register char **ep;
+
+  if (name_end == NULL)
+    {
+      /* Remove the variable from the environment.  */
+      size = strlen (string);
+      for (ep = environ; *ep != NULL; ++ep)
+	if (!strncmp (*ep, string, size) && (*ep)[size] == '=')
+	  {
+	    while (ep[1] != NULL)
+	      {
+		ep[0] = ep[1];
+		++ep;
+	      }
+	    *ep = NULL;
+	    return 0;
+	  }
+    }
+
+  size = 0;
+  for (ep = environ; *ep != NULL; ++ep)
+    if (!strncmp (*ep, string, name_end - string) &&
+	(*ep)[name_end - string] == '=')
+      break;
+    else
+      ++size;
+
+  if (*ep == NULL)
+    {
+      static char **last_environ = NULL;
+      char **new_environ = (char **) scm_malloc ((size + 2) * sizeof (char *));
+      memcpy ((char *) new_environ, (char *) environ, size * sizeof (char *));
+      new_environ[size] = (char *) string;
+      new_environ[size + 1] = NULL;
+      if (last_environ != NULL)
+	free ((char *) last_environ);
+      last_environ = new_environ;
+      environ = new_environ;
+    }
+  else
+    *ep = (char *) string;
+
+  return 0;
+}
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/