Add missed include file.

git-svn-id: https://svn.dealii.org/trunk@3469 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/deal.II/include/numerics/derivative_approximation.h b/deal.II/deal.II/include/numerics/derivative_approximation.h
index 6cb21363bda4e0d2783bbc10f89108eef7c61e83..5efe558ab301298ab181ba316ea088db189d367a 100644 (file)
--- a/deal.II/deal.II/include/numerics/derivative_approximation.h
+++ b/deal.II/deal.II/include/numerics/derivative_approximation.h
@@ -17,7 +17,7 @@
 #include <lac/forward_declarations.h>
 #include <grid/forward_declarations.h>
 #include <base/exceptions.h>
-
+#include <fe/fe_update_flags.h>
 #include <utility>