From f5858af1bc49112f27168dc73ffd88f91d8d4b80 Mon Sep 17 00:00:00 2001
From: Kosyrev Serge <serge.kosyrev@iohk.io>
Date: Mon, 26 Feb 2018 01:34:59 +0300
Subject: [PATCH] ghc841 | hpack:  SMP fix unmerged

---
 .../haskell-modules/configuration-ghc-8.4.x.nix | 17 +++++++++++++++++
 1 file changed, 17 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 6def68bd2a26..6161abdc9931 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
@@ -385,6 +385,23 @@ self: super: {
     };
   });
 
+  ## Unmerged.  PR: https://github.com/sol/hpack/pull/277
+  ## Issue: https://github.com/sol/hpack/issues/276
+  hpack = overrideCabal super.hpack (drv: {
+    ##     • No instance for (Semigroup Dependencies)
+    ##         arising from the 'deriving' clause of a data type declaration
+    ##       Possible fix:
+    src = pkgs.fetchFromGitHub {
+      owner  = "deepfire";
+      repo   = "hpack";
+      rev    = "acce0cffcc1d165a0fd9f0b83878dfbd622ea0d6";
+      sha256 = "1wv0ya1gb1hwd9w8g4z5aig694q3arsqhxv0d4wcp270xnq9ja8y";
+    };
+    ## Setup: Encountered missing dependencies:
+    ## http-client -any, http-client-tls -any, http-types -any
+    libraryHaskellDepends = drv.libraryHaskellDepends ++ (with self; [ http-client http-client-tls http-types ]);
+  });
+
   ## Unmerged.  PR: https://github.com/hanshoglund/monadplus/pull/3
   monadplus = overrideCabal super.monadplus (drv: {
     ##     • No instance for (Semigroup (Partial a b))