From 2fce900513bbd89238c81cb7ed1aa9149a99ad28 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Wed, 29 Jan 2014 18:37:32 +0100
Subject: [PATCH] haskell-lens: jailbreak to fix build with recent
 MonadCatchIO-transformers

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

diff --git a/pkgs/development/libraries/haskell/lens/default.nix b/pkgs/development/libraries/haskell/lens/default.nix
index b0f6b6cd5053..819902d61397 100644
--- a/pkgs/development/libraries/haskell/lens/default.nix
+++ b/pkgs/development/libraries/haskell/lens/default.nix
@@ -23,6 +23,9 @@ cabal.mkDerivation (self: {
     testFrameworkHunit testFrameworkQuickcheck2 testFrameworkTh text
     transformers unorderedContainers vector
   ];
+  patchPhase = ''
+    sed -i lens.cabal -e 's|MonadCatchIO-transformers >=.*,|MonadCatchIO-transformers,|'
+  '';
   doCheck = false;
   meta = {
     homepage = "http://github.com/ekmett/lens/";