From 6b5494ffd5daa8dc0de4741064dc3e71a6a536d1 Mon Sep 17 00:00:00 2001
From: Tom Sydney Kerckhove <syd@cs-syd.eu>
Date: Sun, 12 May 2024 12:25:27 +0200
Subject: [PATCH] haskell: Allow building packages with GHC 9.10

Fixes #311024
---
 pkgs/development/haskell-modules/generic-builder.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index f9acdd0f4a27b..6b85f63f68390 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -567,6 +567,9 @@ stdenv.mkDerivation ({
   # `--test-option`, so Cabal passes it to the underlying test suite binary.
   checkPhase = ''
     runHook preCheck
+
+    unset GHC_PACKAGE_PATH      # Cabal complains if this variable is set during check.
+
     checkFlagsArray+=(
       "--show-details=streaming"
       ${lib.escapeShellArgs (builtins.map (opt: "--test-option=${opt}") testFlags)}