From 9391f0912ffc9b01cdd11ae125a56b44574d257e Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Thu, 29 Mar 2018 11:09:33 +0200
Subject: [PATCH] haskell-flexible-defaults: apply patch to fix build with ghc
 8.4.1

---
 .../development/haskell-modules/configuration-ghc-8.4.x.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
index ec9215175f8..244ee9215d3 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
@@ -643,4 +643,10 @@ self: super: {
     sha256 = "0j859vclcfnz8n2mw466mv00kjsa9gdbrppjc1m3b68jbypdmfvr";
   });
 
+  # Contributed by Bertram Felgenhauer <int-e@gmx.de>.
+  flexible-defaults = appendPatch super.flexible-defaults (pkgs.fetchpatch {
+    url = https://raw.githubusercontent.com/lambdabot/lambdabot/ghc-8.4.1/patches/flexible-defaults-0.0.1.2.patch;
+    sha256 = "1bpsqq80h6nxm04wddgcgyzn0fjfsmhccmqb211jqswv5209znx8";
+  });
+
 }