Index: mutant_relation.hpp
===================================================================
--- mutant_relation.hpp	(revision 64538)
+++ mutant_relation.hpp	(working copy)
@@ -139,7 +139,7 @@
 
     #ifndef BOOST_BIMAP_DISABLE_SERIALIZATION
     template< class Archive >
-    void serialize(Archive & ar, const unsigned int version)
+    void serialize(Archive & ar, const unsigned int /* version */)
     {
         ar & ::boost::serialization::make_nvp("left" , base_::left );
         ar & ::boost::serialization::make_nvp("right", base_::right);
@@ -185,7 +185,7 @@
 
     #ifndef BOOST_BIMAP_DISABLE_SERIALIZATION
     template< class Archive >
-    void serialize(Archive & ar, const unsigned int version)
+    void serialize(Archive & ar, const unsigned int /* version */)
     {
         ar & ::boost::serialization::make_nvp("left" , base_::left );
         ar & ::boost::serialization::make_nvp("right", base_::right);