Include the algorithm library

diff --git a/examples/step-63/step-63.cc b/examples/step-63/step-63.cc
index fec0f3378837ccd3aef7c80a71ab5feda8aa8cc8..d93fbbeed27959ef3132b1b4de8628daf218ca16 100644 (file)
--- a/examples/step-63/step-63.cc
+++ b/examples/step-63/step-63.cc
@@ -66,6 +66,7 @@
 #include <deal.II/multigrid/mg_matrix.h>
 
 // C++:
+#include <algorithm>
 #include <fstream>
 #include <iostream>
 #include <random>