From e32bc0b5c04f0080b4c8505649921e5f7e8d6a5f Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Fri, 22 Dec 2017 13:54:01 -0500
Subject: [PATCH] haskellPackages.lenz: Fix against latest hs-functors

---
 .../haskell-modules/configuration-common.nix          | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index a08697a5792b..58de439d839c 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -1008,4 +1008,15 @@ self: super: {
 
   # https://github.com/alphaHeavy/protobuf/issues/34
   protobuf = dontCheck super.protobuf;
+
+  # https://github.com/strake/lenz.hs/issues/2
+  lenz =
+    let patch = pkgs.fetchpatch
+          { url = https://github.com/strake/lenz.hs/commit/4b9b79104759b9c6b24484455e1eb0d962eb3cff.patch;
+            sha256 = "02i0w9i55a4r251wgjzl5vbk6m2qhilwl7bfp5jwmf22z66sglyn";
+          };
+    in overrideCabal super.lenz (drv:
+      { patches = (drv.patches or []) ++ [ patch ];
+        editedCabalFile = null;
+      });
 }