From 9971d875a462bc393724220f468825eca9e5c38a Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Wed, 25 Oct 2017 17:20:47 +0200
Subject: [PATCH] Fix building on clang

https://hydra.nixos.org/build/62945761
---
 src/libstore/build.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 51afbac7f..9f8edc826 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -2400,10 +2400,10 @@ void DerivationGoal::writeStructuredAttrs()
             }
 
             if (value.is_null())
-                return "''";
+                return std::string("''");
 
             if (value.is_boolean())
-                return value.get<bool>() ? "1" : "";
+                return value.get<bool>() ? std::string("1") : std::string("");
 
             return {};
         };