From ab0bc1ecaf4357801f83bc41868b4bfb7564a369 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <vcunat@gmail.com>
Date: Fri, 11 Mar 2016 15:53:43 +0100
Subject: [PATCH] symlinkJoin: preferLocalBuild && !allowSubstitutes

---
 pkgs/build-support/trivial-builders.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/build-support/trivial-builders.nix b/pkgs/build-support/trivial-builders.nix
index 93b8b1cbc428..fef91e1d89dc 100644
--- a/pkgs/build-support/trivial-builders.nix
+++ b/pkgs/build-support/trivial-builders.nix
@@ -48,7 +48,10 @@ rec {
 
   # Create a forest of symlinks to the files in `paths'.
   symlinkJoin = name: paths:
-    runCommand name { inherit paths; }
+    runCommand name
+      { inherit paths;
+        preferLocalBuild = true; allowSubstitutes = false;
+      }
       ''
         mkdir -p $out
         for i in $paths; do