From 0170f90d6c3e56b98289f8956d1add375fcfb423 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <v@cunat.cz>
Date: Fri, 25 Jul 2025 15:19:41 +0200
Subject: [PATCH] mesa.disallowedRequisites: avoid `null` values

See e.g. 40df6d5
---
 pkgs/development/libraries/mesa/default.nix | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/libraries/mesa/default.nix b/pkgs/development/libraries/mesa/default.nix
index 3554b3ccf15f..bd64c3fa2430 100644
--- a/pkgs/development/libraries/mesa/default.nix
+++ b/pkgs/development/libraries/mesa/default.nix
@@ -347,9 +347,9 @@ stdenv.mkDerivation {
     (buildPackages.mesa.cross_tools or null)
   ];
 
-  disallowedRequisites = lib.optionals needNativeCLC [
-    (buildPackages.mesa.cross_tools or null)
-  ];
+  disallowedRequisites = lib.optional (
+    needNativeCLC && buildPackages.mesa ? cross_tools
+  ) buildPackages.mesa.cross_tools;
 
   doCheck = false;