From dbffdee9d27b8f672682de958aa6b8e97a5f064c Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Sat, 22 Sep 2018 15:48:30 +0200
Subject: [PATCH] Add a couple of overrides to fix build with GHC 8.6.1.

---
 .../haskell-modules/configuration-ghc-8.6.x.nix            | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
index 42712df3295..e4c4c0b1906 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
@@ -57,4 +57,11 @@ self: super: {
   tar = doJailbreak super.tar;                               # containers >=0.2 && <0.6
   test-framework = doJailbreak super.test-framework;         # containers >=0.1 && <0.6
 
+  # Older versions don't work with ghc 8.6.1:
+  hspec-core = self.hspec-core_2_5_6;
+  hspec-core_2_5_6 = super.hspec-core_2_5_6.overrideScope (self: super: { QuickCheck = self.QuickCheck_2_12_4; });
+  hspec-meta = self.hspec-meta_2_5_6;
+  optparse-applicative = doJailbreak super.optparse-applicative;
+  unordered-containers = dontCheck super.unordered-containers;
+
 }