https://github.com/Project-OSRM/osrm-backend/pull/7220

Index: include/server/connection.hpp
--- include/server/connection.hpp.orig
+++ include/server/connection.hpp
@@ -8,6 +8,7 @@
 
 #include <boost/array.hpp>
 #include <boost/asio.hpp>
+#include <boost/asio/deadline_timer.hpp>
 #include <boost/config.hpp>
 #include <boost/version.hpp>
 
