From e7b25c78a596bb5e7aad1b2866a758ae726d9be8 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Tue, 15 Oct 2013 11:02:29 +0200
Subject: [PATCH] haskell-snap: jailbreak to fix build with recent versions of
 lens

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

diff --git a/pkgs/development/libraries/haskell/snap/snap.nix b/pkgs/development/libraries/haskell/snap/snap.nix
index 94f452f69b88..15fe497b88da 100644
--- a/pkgs/development/libraries/haskell/snap/snap.nix
+++ b/pkgs/development/libraries/haskell/snap/snap.nix
@@ -20,6 +20,7 @@ cabal.mkDerivation (self: {
     unorderedContainers vector vectorAlgorithms xmlhtml
   ];
   jailbreak = true;
+  patchPhase = "sed -i -e 's|lens .*|lens|' snap.cabal";
   meta = {
     homepage = "http://snapframework.com/";
     description = "Top-level package for the Snap Web Framework";