From f35d23b16d99087831d9f5e1fe2fb66f7816da65 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Teo=20Klestrup=20R=C3=B6ijezon?= <teo@nullable.se>
Date: Thu, 25 Aug 2016 22:16:06 +0200
Subject: [PATCH] buildStackProject: Fix missing STACK_ROOT causing build
 errors

---
 pkgs/development/haskell-modules/generic-stack-builder.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/generic-stack-builder.nix b/pkgs/development/haskell-modules/generic-stack-builder.nix
index 09bd38ccc933..8da26d8be82f 100644
--- a/pkgs/development/haskell-modules/generic-stack-builder.nix
+++ b/pkgs/development/haskell-modules/generic-stack-builder.nix
@@ -28,7 +28,10 @@ stdenv.mkDerivation (args // {
 
   preferLocalBuild = true;
 
-  configurePhase = args.configurePhase or "stack setup";
+  configurePhase = args.configurePhase or ''
+    export STACK_ROOT=$NIX_BUILD_TOP/.stack
+    stack setup
+  '';
 
   buildPhase = args.buildPhase or "stack build";