From 3aa6b99d8389c8981e2133540696626c256a0bf1 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Thu, 20 Mar 2014 13:18:11 +0100
Subject: [PATCH] haskell-snap: jailbreak some more to support lens 4.1 or
 later

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

diff --git a/pkgs/development/libraries/haskell/snap/snap.nix b/pkgs/development/libraries/haskell/snap/snap.nix
index e12138d08be..a0c4e4db5a1 100644
--- a/pkgs/development/libraries/haskell/snap/snap.nix
+++ b/pkgs/development/libraries/haskell/snap/snap.nix
@@ -20,6 +20,9 @@ cabal.mkDerivation (self: {
     unorderedContainers vector vectorAlgorithms xmlhtml
   ];
   jailbreak = true;
+  patchPhase = ''
+    sed -i -r -e 's|lens +>= 3.7.6.*&& < 4.1|lens >= 3.7.6|' snap.cabal
+  '';
   meta = {
     homepage = "http://snapframework.com/";
     description = "Top-level package for the Snap Web Framework";