From 57e3fc341f297b63e2f49853d0115add7c589b04 Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Wed, 16 Jul 2014 01:27:39 -0500
Subject: [PATCH] haskell-djinn: corrections for darwin

---
 pkgs/development/libraries/haskell/djinn/default.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/development/libraries/haskell/djinn/default.nix b/pkgs/development/libraries/haskell/djinn/default.nix
index d643b87c42e..fbe450df19a 100644
--- a/pkgs/development/libraries/haskell/djinn/default.nix
+++ b/pkgs/development/libraries/haskell/djinn/default.nix
@@ -9,6 +9,9 @@ cabal.mkDerivation (self: {
   isLibrary = false;
   isExecutable = true;
   buildDepends = [ haskeline mtl ];
+  preConfigure = self.stdenv.lib.optionalString self.stdenv.isDarwin ''
+    sed -i 's/-Wall -optl-Wl/-Wall/' djinn.cabal
+  '';
   meta = {
     homepage = "http://www.augustsson.net/Darcs/Djinn/";
     description = "Generate Haskell code from a type";