diff --git a/dns64.h b/dns64.h
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--- /dev/null
+++ b/dns64.h
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+/*
+ * Copyright 2011 Daniel Drown
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * dns64.h - find the nat64 prefix with a dns64 lookup
+ */
+#ifndef __DNS64_H__
+#define __DNS64_H__
+
+int plat_prefix(const char *ipv4_name, struct in6_addr *prefix);
+
+#endif