From dec9ac364a4e894662e4f1895eb014bdb8abbd8f Mon Sep 17 00:00:00 2001
From: Chuck <chuck@intelligence.org>
Date: Thu, 2 Apr 2020 18:09:34 -0700
Subject: [PATCH] darcs: Fix build (Use old GHC)

This is fixed at upstream's head; this change can be reverted after
darcs cuts a new release (current release is 2.14.2).
---
 pkgs/development/haskell-modules/configuration-common.nix     | 4 ++++
 .../haskell-modules/configuration-hackage2nix.yaml            | 1 -
 pkgs/top-level/all-packages.nix                               | 2 +-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 23853787b9c8..9c3b99f3525f 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -1498,4 +1498,8 @@ self: super: {
     # version of Polysemy the plugin goes with
     polysemy = self.polysemy_1_3_0_0;
   };
+
+  # Fixed at head, but hasn't cut a release in awhile.
+  darcs = doJailbreak super.darcs;
+
 } // import ./configuration-tensorflow.nix {inherit pkgs haskellLib;} self super
diff --git a/pkgs/development/haskell-modules/configuration-hackage2nix.yaml b/pkgs/development/haskell-modules/configuration-hackage2nix.yaml
index 5b98cdb2dad7..2239053f877c 100644
--- a/pkgs/development/haskell-modules/configuration-hackage2nix.yaml
+++ b/pkgs/development/haskell-modules/configuration-hackage2nix.yaml
@@ -3953,7 +3953,6 @@ broken-packages:
   - Dao
   - dao
   - dapi
-  - darcs
   - darcs-benchmark
   - darcs-beta
   - darcs-buildpackage
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 2b47fdbc72e7..1fa50a1eb20f 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -18883,7 +18883,7 @@ in
 
   dablin = callPackage ../applications/radio/dablin { };
 
-  darcs = haskell.lib.overrideCabal (haskell.lib.justStaticExecutables haskellPackages.darcs) (drv: {
+  darcs = haskell.lib.overrideCabal (haskell.lib.justStaticExecutables haskell.packages.ghc865.darcs) (drv: {
     configureFlags = (stdenv.lib.remove "-flibrary" drv.configureFlags or []) ++ ["-f-library"];
   });