From 9a39115172986f55f3eeabab452ecb79709a6a09 Mon Sep 17 00:00:00 2001
From: sternenseemann <sternenseemann@systemli.org>
Date: Thu, 5 Aug 2021 08:28:42 +0200
Subject: [PATCH] haskellPackages.GLHUI: fix build on darwin

---
 pkgs/development/haskell-modules/configuration-darwin.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkgs/development/haskell-modules/configuration-darwin.nix b/pkgs/development/haskell-modules/configuration-darwin.nix
index 6d884d849d38..50d627376dd4 100644
--- a/pkgs/development/haskell-modules/configuration-darwin.nix
+++ b/pkgs/development/haskell-modules/configuration-darwin.nix
@@ -198,4 +198,12 @@ self: super: {
   # We are lacking pure pgrep at the moment for tests to work
   tmp-postgres = dontCheck super.tmp-postgres;
 
+  # On darwin librt doesn't exist and will fail to link against,
+  # however linking against it is also not necessary there
+  GLHUI = overrideCabal super.GLHUI (drv: {
+    postPatch = ''
+      substituteInPlace GLHUI.cabal --replace " rt" ""
+    '' + (drv.postPatch or "");
+  });
+
 }