From 2c84f41a8e27d9a17ac15e22afef495af3ba55c9 Mon Sep 17 00:00:00 2001
From: byteforge38 <joseph.mc0803@gmail.com>
Date: Thu, 15 Jan 2026 19:08:33 -0800
Subject: [PATCH] stdenv: keep replaceStdenv fallback for non-module contexts

---
 pkgs/stdenv/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/stdenv/default.nix b/pkgs/stdenv/default.nix
index 98aefc2bf568..53f63245c919 100644
--- a/pkgs/stdenv/default.nix
+++ b/pkgs/stdenv/default.nix
@@ -43,7 +43,7 @@ in
 # Select the appropriate stages for the platform `system'.
 if crossSystem != localSystem || crossOverlays != [ ] then
   stagesCross
-else if config.replaceStdenv != null then
+else if (config.replaceStdenv or null) != null then
   stagesCustom
 else if localSystem.isLinux then
   stagesLinux