From 8efe937a350eca57cbc3cb9837f28d985e0d281f Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Sat, 16 Dec 2017 00:48:09 +0100
Subject: [PATCH] Fix build on gcc 7

Fixes #1738.
---
 src/libstore/nar-accessor.hh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libstore/nar-accessor.hh b/src/libstore/nar-accessor.hh
index 1903355a..2871199d 100644
--- a/src/libstore/nar-accessor.hh
+++ b/src/libstore/nar-accessor.hh
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <functional>
+
 #include "fs-accessor.hh"
 
 namespace nix {