diff --git a/libs/functional/hash/test/link_test.cpp b/libs/functional/hash/test/link_test.cpp
new file mode 100644
index 0000000..bdae262
--- /dev/null
+++ b/libs/functional/hash/test/link_test.cpp
@@ -0,0 +1,11 @@
+
+// Copyright 2005-2009 Daniel James.
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include "./config.hpp"
+
+#include <boost/functional/hash.hpp>
+
+extern int f();
+int main() { return f(); }