From 1e843060649ee96542efc2e0b11fbdbb02308bde Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 14 Sep 2017 13:27:01 -0600
Subject: [PATCH] Add an #include file.

Specifically, include the one that is necessary for std::enable_if.
---
 include/deal.II/fe/fe_system.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/deal.II/fe/fe_system.h b/include/deal.II/fe/fe_system.h
index 60074cb05c..ed3cad06e3 100644
--- a/include/deal.II/fe/fe_system.h
+++ b/include/deal.II/fe/fe_system.h
@@ -24,9 +24,11 @@
 #include <deal.II/base/thread_management.h>
 #include <deal.II/fe/fe.h>
 #include <deal.II/fe/fe_tools.h>
+
 #include <vector>
 #include <memory>
 #include <utility>
+#include <type_traits>
 
 
 DEAL_II_NAMESPACE_OPEN
-- 
2.39.5