Add missing #ifdef DEAL_II_WITH_THREADS around tbb calls

diff --git a/include/deal.II/base/parallel.h b/include/deal.II/base/parallel.h
index 8b9d5cc49159b601ff6f13ba0c8929732d5d2358..3fd86d2df1a66991aafb3e6582b1ac5c2e8381db 100644 (file)
--- a/include/deal.II/base/parallel.h
+++ b/include/deal.II/base/parallel.h
@@ -147,6 +147,7 @@ namespace parallel
 
 
 
+#ifdef DEAL_II_WITH_THREADS
     /**
      * Encapsulate tbb::parallel_for.
      */
@@ -179,6 +180,7 @@ namespace parallel
                         functor,
                         *partitioner);
     }
+#endif
   } // namespace internal
 
   /**