From 6c6d4daf79263066efae45467cb4a95021ad2bb8 Mon Sep 17 00:00:00 2001
From: loner <2788892716@qq.com>
Date: Mon, 19 Jan 2026 03:20:55 +0800
Subject: [PATCH] stdenv: handle null replaceStdenv as identity

---
 pkgs/stdenv/custom/default.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/stdenv/custom/default.nix b/pkgs/stdenv/custom/default.nix
index c8f1bc66a06c..4520f0c9905a 100644
--- a/pkgs/stdenv/custom/default.nix
+++ b/pkgs/stdenv/custom/default.nix
@@ -31,7 +31,10 @@ bootStages
     stdenv =
       assert vanillaPackages.stdenv.hostPlatform == localSystem;
       assert vanillaPackages.stdenv.targetPlatform == localSystem;
-      config.replaceStdenv { pkgs = vanillaPackages; };
+      let
+        fn = config.replaceStdenv or null;
+      in
+      if fn == null then vanillaPackages.stdenv else fn { pkgs = vanillaPackages; };
   })
 
 ]