diff -bur conky-1.10.6-orig/src/luamm.hh conky-1.10.6/src/luamm.hh
--- conky-1.10.6-orig/src/luamm.hh      2016-12-04 17:13:57.000000000 +0200
+++ conky-1.10.6/src/luamm.hh   2017-05-31 20:05:59.000000000 +0300
@@ -28,6 +28,7 @@
 #include <exception>
 #include <stdexcept>
 #include <string>
+#include <functional>
 
 #include <lua.hpp>