Ensure we don't call a function that is only declared if we use MPI+p4est.

diff --git a/source/grid/grid_tools.cc b/source/grid/grid_tools.cc
index f47127519ec80b5fd5bc2e978ad66909a9df9cb5..4d23a60a85599fb943608f91e238c815ae025025 100644 (file)
--- a/source/grid/grid_tools.cc
+++ b/source/grid/grid_tools.cc
@@ -753,8 +753,12 @@ namespace GridTools
                 }
             }
 
+#if DEAL_II_USE_P4EST
         distributed_triangulation
         ->communicate_locally_moved_vertices(locally_owned_vertices);
+#else
+        Assert (false, ExcInternalError());
+#endif
       }
     else
       // if this is a sequential triangulation, we could in principle