$OpenBSD: patch-common_tool_tool_manager_cpp,v 1.1 2019/11/08 14:43:53 sthen Exp $

Index: common/tool/tool_manager.cpp
--- common/tool/tool_manager.cpp.orig
+++ common/tool/tool_manager.cpp
@@ -27,6 +27,7 @@
 #include <map>
 #include <stack>
 #include <algorithm>
+#include <functional>
 
 #include <core/optional.h>