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diff --git a/rsync/checksum.h b/rsync/checksum.h
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+/*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
+ *
+ * librsync -- the library for network deltas
+ * $Id$
+ *
+ * Copyright (C) 2000, 2001 by Martin Pool <mbp@samba.org>
+ *
+ * This program 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 program 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 program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+rs_weak_sum_t rs_calc_weak_sum(void const *buf1, int len);
+
+void rs_calc_strong_sum(void const *buf, size_t buf_len, rs_strong_sum_t *);
+
+/* We should make this something other than zero to improve the
+ * checksum algorithm: tridge suggests a prime number. */
+#define RS_CHAR_OFFSET 31
+