Add missing include file.

git-svn-id: https://svn.dealii.org/trunk@10259 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/base/include/base/symmetric_tensor.h b/deal.II/base/include/base/symmetric_tensor.h
index dbf3239c0f85b8ebd4082c7462f9a8bdafccc681..a96c8a70a8d02dd7d3d2e2fdb3876c0caac293c0 100644 (file)
--- a/deal.II/base/include/base/symmetric_tensor.h
+++ b/deal.II/base/include/base/symmetric_tensor.h
@@ -14,6 +14,9 @@
 #define __deal2__symmetric_tensor_h
 
 
+#include <base/tensor.h>
+
+
 template <int rank, int dim> class SymmetricTensor;
 template <int dim> class SymmetricTensor<2,dim>;