--- lldb/include/lldb/Utility/TaskPool.h	2016-09-06 22:57:50.000000000 +0200
+++ lldb/include/lldb/Utility/TaskPool.h	2017-05-09 10:11:17.802838086 +0200
@@ -33,6 +33,7 @@
 #include <queue>
 #include <thread>
 #include <vector>
+#include <functional>
 
 // Global TaskPool class for running tasks in parallel on a set of worker thread
 // created the first