add include

diff --git a/examples/step-63/step-63.cc b/examples/step-63/step-63.cc
index d2b9a18715f64fc84098ad00a95e1e424d2e5a62..2534596dc665ff478f941e5e0203c47e6f805f5a 100644 (file)
--- a/examples/step-63/step-63.cc
+++ b/examples/step-63/step-63.cc
@@ -20,8 +20,10 @@
 // @note: This is work in progress and will be an example for block smoothers
 // in geometric multigrid.
 
+#include <iostream>
 #include <deal.II/base/exceptions.h>
 
+
 int main()
 {
   try