From bdd16df074e978fcd32d4239e3dcd464bff32691 Mon Sep 17 00:00:00 2001
From: Daiderd Jordan <daiderd@gmail.com>
Date: Sat, 7 Mar 2020 18:51:38 +0100
Subject: [PATCH] vaultenv: fix build

Don't hard fail on warnings, having eg. some redundant imports is fine.
---
 pkgs/development/tools/haskell/vaultenv/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/development/tools/haskell/vaultenv/default.nix b/pkgs/development/tools/haskell/vaultenv/default.nix
index 6c339bf31b5..419f4530dca 100644
--- a/pkgs/development/tools/haskell/vaultenv/default.nix
+++ b/pkgs/development/tools/haskell/vaultenv/default.nix
@@ -15,6 +15,11 @@ mkDerivation rec {
 
   buildTools = [ hpack ];
 
+  prePatch = ''
+    substituteInPlace package.yaml \
+        --replace -Werror ""
+  '';
+
   isLibrary = false;
   isExecutable = true;
   executableHaskellDepends = [