diff --git a/ompi/contrib/vt/vt/tools/vtunify/vt_unify_defs_recs.h b/ompi/contrib/vt/vt/tools/vtunify/vt_unify_defs_recs.h
index 18e17e0f80..51b84aaefe 100644
--- a/ompi/contrib/vt/vt/tools/vtunify/vt_unify_defs_recs.h
+++ b/ompi/contrib/vt/vt/tools/vtunify/vt_unify_defs_recs.h
@@ -89,6 +89,14 @@ struct DefRec_BaseS
                         VT_MPI_INT & bufferPos );
 #endif // VT_MPI
 
+   // NOTE: this operator is actually not used but necessary to work around
+   // a build error with the Clang++ compiler
+   // (see http://www.open-mpi.org/community/lists/devel/2012/02/10419.php)
+   bool operator<( const DefRec_BaseS & a ) const
+   {
+      return dtype < a.dtype;
+   }
+
    DefRecTypeT dtype;
    uint32_t    loccpuid;
    uint32_t    deftoken;
diff --git a/ompi/contrib/vt/vt/tools/vtunify/vt_unify_tkfac_scope.hh b/ompi/contrib/vt/vt/tools/vtunify/vt_unify_tkfac_scope.hh
index 96a3f41702..84ac913456 100644
--- a/ompi/contrib/vt/vt/tools/vtunify/vt_unify_tkfac_scope.hh
+++ b/ompi/contrib/vt/vt/tools/vtunify/vt_unify_tkfac_scope.hh
@@ -60,7 +60,7 @@ TokenFactoryScopeC<T>::create( const void * localDef, uint32_t globalToken )
       else
          global_def.deftoken = globalToken;
 
-      m_globDefs->insert( global_def ).first;
+      m_globDefs->insert( global_def );
    }
 
    // set token translation for process, if necessary