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diff --git a/src/kdc/extern.h b/src/kdc/extern.h
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+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* kdc/extern.h */
+/*
+ * Copyright 1990,2001,2007,2009 by the Massachusetts Institute of Technology.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ */
+
+#ifndef __KRB5_KDC_EXTERN__
+#define __KRB5_KDC_EXTERN__
+
+/* various externs for KDC */
+extern krb5_data        empty_string;   /* an empty string */
+extern krb5_timestamp   kdc_infinity;   /* greater than all other timestamps */
+extern krb5_keyblock    psr_key;        /* key for predicted sam response */
+extern const int        kdc_modifies_kdb;
+extern krb5_int32       max_dgram_reply_size; /* maximum datagram size */
+
+extern const int        vague_errors;
+#endif /* __KRB5_KDC_EXTERN__ */