From 9619c92cb0a895047849e9db3c417fa2126e47ca Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Fri, 31 Oct 2014 14:12:11 +0100
Subject: [PATCH] haskell-diagrams-core: jailbreak to fix build with recent
 versions of 'lens'

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

diff --git a/pkgs/development/libraries/haskell/diagrams/core.nix b/pkgs/development/libraries/haskell/diagrams/core.nix
index 18f362e0c21f..1df0cc32a5b8 100644
--- a/pkgs/development/libraries/haskell/diagrams/core.nix
+++ b/pkgs/development/libraries/haskell/diagrams/core.nix
@@ -12,6 +12,7 @@ cabal.mkDerivation (self: {
     dualTree lens MemoTrie monoidExtras newtype semigroups vectorSpace
     vectorSpacePoints
   ];
+  jailbreak = true;
   meta = {
     homepage = "http://projects.haskell.org/diagrams";
     description = "Core libraries for diagrams EDSL";