-extern heap_key HeapKeyGen_StoreEntry_LFUDA(void *entry, double age);
-extern heap_key HeapKeyGen_StoreEntry_GDSF(void *entry, double age);
-extern heap_key HeapKeyGen_StoreEntry_LRU(void *entry, double age);
+/*
+ * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
+ *
+ * Squid software is distributed under GPLv2+ license and includes
+ * contributions from numerous individuals and organizations.
+ * Please see the COPYING and CONTRIBUTORS files for details.
+ */
+
+#ifndef _SQUIDINC_STORE_HEAP_REPLACEMENT_H
+#define _SQUIDINC_STORE_HEAP_REPLACEMENT_H
+
+#include "heap.h"
+
+heap_key HeapKeyGen_StoreEntry_LFUDA(void *entry, double age);
+heap_key HeapKeyGen_StoreEntry_GDSF(void *entry, double age);
+heap_key HeapKeyGen_StoreEntry_LRU(void *entry, double age);
+
+#endif /* _SQUIDINC_STORE_HEAP_REPLACEMENT_H */
+