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diff --git a/src/util/dict_env.c b/src/util/dict_env.c
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+/*++
+/* NAME
+/* dict_env 3
+/* SUMMARY
+/* dictionary manager interface to environment variables
+/* SYNOPSIS
+/* #include <dict_env.h>
+/*
+/* DICT *dict_env_open(name, dummy, dict_flags)
+/* const char *name;
+/* int dummy;
+/* int dict_flags;
+/* DESCRIPTION
+/* dict_env_open() opens the environment variable array and
+/* makes it accessible via the generic operations documented
+/* in dict_open(3). The \fIname\fR and \fIdummy\fR arguments
+/* are ignored.
+/* SEE ALSO
+/* dict(3) generic dictionary manager
+/* safe_getenv(3) safe getenv() interface
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include "sys_defs.h"
+#include <stdio.h> /* sprintf() prototype */
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include "mymalloc.h"
+#include "msg.h"
+#include "safe.h"
+#include "stringops.h"
+#include "dict.h"
+#include "dict_env.h"
+
+/* dict_env_update - update environment array */
+
+static int dict_env_update(DICT *dict, const char *name, const char *value)
+{
+ dict->error = 0;
+
+ /*
+ * Optionally fold the key.
+ */
+ if (dict->flags & DICT_FLAG_FOLD_FIX) {
+ if (dict->fold_buf == 0)
+ dict->fold_buf = vstring_alloc(10);
+ vstring_strcpy(dict->fold_buf, name);
+ name = lowercase(vstring_str(dict->fold_buf));
+ }
+ if (setenv(name, value, 1))
+ msg_fatal("setenv: %m");
+
+ return (DICT_STAT_SUCCESS);
+}
+
+/* dict_env_lookup - access environment array */
+
+static const char *dict_env_lookup(DICT *dict, const char *name)
+{
+ dict->error = 0;
+
+ /*
+ * Optionally fold the key.
+ */
+ if (dict->flags & DICT_FLAG_FOLD_FIX) {
+ if (dict->fold_buf == 0)
+ dict->fold_buf = vstring_alloc(10);
+ vstring_strcpy(dict->fold_buf, name);
+ name = lowercase(vstring_str(dict->fold_buf));
+ }
+ return (safe_getenv(name));
+}
+
+/* dict_env_close - close environment dictionary */
+
+static void dict_env_close(DICT *dict)
+{
+ if (dict->fold_buf)
+ vstring_free(dict->fold_buf);
+ dict_free(dict);
+}
+
+/* dict_env_open - make association with environment array */
+
+DICT *dict_env_open(const char *name, int unused_flags, int dict_flags)
+{
+ DICT *dict;
+
+ dict = dict_alloc(DICT_TYPE_ENVIRON, name, sizeof(*dict));
+ dict->lookup = dict_env_lookup;
+ dict->update = dict_env_update;
+ dict->close = dict_env_close;
+ dict->flags = dict_flags | DICT_FLAG_FIXED;
+ if (dict_flags & DICT_FLAG_FOLD_FIX)
+ dict->fold_buf = vstring_alloc(10);
+ dict->owner.status = DICT_OWNER_TRUSTED;
+ return (DICT_DEBUG (dict));
+}