From bcd51d2f1e03b0ddca0df20b9f6a9ebe457e73d3 Mon Sep 17 00:00:00 2001
From: Ryan Curtin <ryan@ratml.org>
Date: Wed, 15 Nov 2023 08:55:36 -0500
Subject: [PATCH] Fix other use of cereal macro not available in older
 versions.

---
 src/mlpack/core/cereal/template_class_version.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mlpack/core/cereal/template_class_version.hpp b/src/mlpack/core/cereal/template_class_version.hpp
index ea9e508964..bb68af0705 100644
--- a/src/mlpack/core/cereal/template_class_version.hpp
+++ b/src/mlpack/core/cereal/template_class_version.hpp
@@ -63,7 +63,7 @@ struct Version<CEREAL_UNPACK TYPE>                                             \
     return CEREAL_UNPACK VERSION_NUMBER;                                       \
   }                                                                            \
                                                                                \
-  CEREAL_UNUSED_FUNCTION                                                       \
+  static void unused() { (void) version; }                                     \
 }; /* end Version */                                                           \
                                                                                \
 template<CEREAL_UNPACK ARGS>                                                   \