--- ./include/Rivet/Tools/RivetSTL.hh.orig	2017-08-03 11:49:33.005431033 +0200
+++ ./include/Rivet/Tools/RivetSTL.hh	2017-08-03 11:50:13.817841608 +0200
@@ -19,6 +19,7 @@
 #include <iomanip>
 #include <cmath>
 #include <limits>
+#include <functional>
 
 
 #ifndef foreach