From e5a51b9ce446d8cc12f0d086f0d68638ddcb9249 Mon Sep 17 00:00:00 2001
From: Artturin <Artturin@artturin.com>
Date: Fri, 6 Dec 2024 03:26:53 +0200
Subject: [PATCH] DONTDROP haskellPackages.mkDerivation: Fix `cannot coerce
 null to a string`
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https://www.github.com/NixOS/nixpkgs/issues/362272

Fixes

```
$ nix repl --file . --system aarch64-darwin
nix-repl> pkgsCross.aarch64-multiplatform.haskellPackages.ghc-lib.env
error:
       … while evaluating attribute 'LOCALE_ARCHIVE' of derivation 'ghc-shell-for-ghc-lib-aarch64-unknown-linux-gnu-9.6.6.20240701-aarch64-unknown-linux-gnu'
       error: cannot coerce null to a string: null
```
---
 pkgs/development/haskell-modules/generic-builder.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index 14afa3dfe6b44e..079698ebd13fa3 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -802,7 +802,7 @@ stdenv.mkDerivation ({
         buildInputs =
           otherBuildInputsSystem;
         LANG = "en_US.UTF-8";
-        LOCALE_ARCHIVE = lib.optionalString (stdenv.hostPlatform.libc == "glibc") "${buildPackages.glibcLocales}/lib/locale/locale-archive";
+        LOCALE_ARCHIVE = lib.optionalString (stdenv.hostPlatform.libc == "glibc" && buildPackages.glibcLocales != null) "${buildPackages.glibcLocales}/lib/locale/locale-archive";
         "NIX_${ghcCommandCaps}" = "${ghcEnv}/bin/${ghcCommand}";
         "NIX_${ghcCommandCaps}PKG" = "${ghcEnv}/bin/${ghcCommand}-pkg";
         # TODO: is this still valid?