Fix build on gcc 7

Fixes #1738.
2017-12-16 00:49:31 +01:00
parent 1dffbff57d
commit 8efe937a35
1 changed files with 2 additions and 0 deletions
@@ -1,5 +1,7 @@
 #pragma once

+#include <functional>
+
 #include "fs-accessor.hh"

 namespace nix {