scheduler.hpp in passenger-6.0.8

- old
+ new

@@ -6,10 +6,11 @@
 
 #ifndef BOOST_THREAD_EXECUTORS_SCHEDULER_HPP
 #define BOOST_THREAD_EXECUTORS_SCHEDULER_HPP
 
 #include <boost/thread/detail/config.hpp>
+#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION && defined BOOST_THREAD_PROVIDES_EXECUTORS && defined BOOST_THREAD_USES_MOVE
 #include <boost/thread/executors/detail/scheduled_executor_base.hpp>
 
 #include <boost/chrono/time_point.hpp>
 #include <boost/chrono/duration.hpp>
 #include <boost/chrono/system_clocks.hpp>
@@ -276,6 +277,7 @@
 # pragma warning(pop)
 #endif
 
 #include <boost/config/abi_suffix.hpp>
 
+#endif
 #endif