diff -r 18c89646185e -r d51126dc39fa lemon/static_graph.h
--- a/lemon/static_graph.h	Thu Apr 02 12:57:18 2015 +0200
+++ b/lemon/static_graph.h	Thu Apr 02 13:36:16 2015 +0200
@@ -203,7 +203,7 @@
       built = true;
 
       node_num = n;
-      arc_num = std::distance(first, last);
+      arc_num = static_cast<int>(std::distance(first, last));
 
       node_first_out = new int[node_num + 1];
       node_first_in = new int[node_num];