From ce35986f7fa8035359a32b2c3350f875a3ad5c15 Mon Sep 17 00:00:00 2001
From: Eman Resu <78693624+quatquatt@users.noreply.github.com>
Date: Wed, 29 Apr 2026 03:44:18 -0400
Subject: [PATCH] stdenv/mkDerivation: only run zipAttrsWith if we have to

If attrs.outputChecks.${name} is undefined, we'd be performing an
unnecessary no-op.
---
 pkgs/stdenv/generic/make-derivation.nix | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/pkgs/stdenv/generic/make-derivation.nix b/pkgs/stdenv/generic/make-derivation.nix
index 7f0b8c2809ad..caa2e412af6e 100644
--- a/pkgs/stdenv/generic/make-derivation.nix
+++ b/pkgs/stdenv/generic/make-derivation.nix
@@ -784,10 +784,14 @@ let
                 inherit name;
                 value =
                   let
-                    raw = zipAttrsWith (_: concatLists) [
-                      attrsOutputChecksFiltered
-                      (makeOutputChecks attrs.outputChecks.${name} or { })
-                    ];
+                    raw =
+                      if attrs ? outputChecks.${name} then
+                        zipAttrsWith (_: concatLists) [
+                          attrsOutputChecksFiltered
+                          (makeOutputChecks attrs.outputChecks.${name})
+                        ]
+                      else
+                        attrsOutputChecksFiltered;
                   in
                   # separateDebugInfo = true will put all sorts of files in
                   # the debug output which could carry references, but