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diff --git a/src/util/mac_parse.h b/src/util/mac_parse.h
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+#ifndef _MAC_PARSE_H_INCLUDED_
+#define _MAC_PARSE_H_INCLUDED_
+
+/*++
+/* NAME
+/* mac_parse 3h
+/* SUMMARY
+/* locate macro references in string
+/* SYNOPSIS
+/* #include <mac_parse.h>
+/* DESCRIPTION
+/* .nf
+
+ /*
+ * Utility library.
+ */
+#include <vstring.h>
+
+ /*
+ * External interface.
+ */
+#define MAC_PARSE_LITERAL 1
+#define MAC_PARSE_EXPR 2
+#define MAC_PARSE_VARNAME MAC_PARSE_EXPR /* 2.1 compatibility */
+
+#define MAC_PARSE_OK 0
+#define MAC_PARSE_ERROR (1<<0)
+#define MAC_PARSE_UNDEF (1<<1)
+#define MAC_PARSE_USER 2 /* start user definitions */
+
+typedef int (*MAC_PARSE_FN) (int, VSTRING *, void *);
+
+extern int WARN_UNUSED_RESULT mac_parse(const char *, MAC_PARSE_FN, void *);
+
+/* 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
+/*--*/
+
+#endif