From f66bbd8c7bb1472facf8917e58e3cd4f6ddfa1b5 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Wed, 7 Oct 2020 21:25:06 +0200
Subject: [PATCH] Doh

---
 src/libstore/build.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 0585905e0..e1774237b 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -3810,7 +3810,7 @@ void DerivationGoal::runChild()
                     throw Error("unsupported builtin function '%1%'", string(drv->builder, 8));
                 _exit(0);
             } catch (std::exception & e) {
-                writeFull(STDERR_FILENO, e.what() + "\n");
+                writeFull(STDERR_FILENO, e.what() + std::string("\n"));
                 _exit(1);
             }
         }