From 2223b2cece3c0e0a4537b6578aad44c6078936d6 Mon Sep 17 00:00:00 2001
From: amesgen <amesgen@amesgen.de>
Date: Tue, 3 Jun 2025 00:39:20 +0200
Subject: [PATCH] Pre-existing pkgs: add `system-cxx-std-lib`

---
 overlays/haskell.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/overlays/haskell.nix b/overlays/haskell.nix
index d6f2a7c9b..3e6b6ac8d 100644
--- a/overlays/haskell.nix
+++ b/overlays/haskell.nix
@@ -1118,6 +1118,8 @@ final: prev: {
             "semaphore-compat"
             "stm"
             "xhtml"
+          ] ++ final.lib.optionals (builtins.compareVersions ghc.version "9.4" > 0) [
+            "system-cxx-std-lib"
           ] ++ final.lib.optionals (
                   !final.stdenv.targetPlatform.isGhcjs
                && !final.stdenv.targetPlatform.isWindows