From c42757764ca0fcfb190a535a92fd04111f331a4a Mon Sep 17 00:00:00 2001
From: Yueh-Shun Li <shamrocklee@posteo.net>
Date: Sun, 17 Aug 2025 04:22:04 +0800
Subject: [PATCH] buildEnv: specify extraPathsFrom a string as expected by the
 builder

Specify `extraPathsFrom` as a string using `lib.optionalString` instead of a singleton list using `lib.optional` to align with the current behavior of the Perl build script.
---
 pkgs/build-support/buildenv/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/build-support/buildenv/default.nix b/pkgs/build-support/buildenv/default.nix
index e694a9b838e1..0f95f118d4bf 100644
--- a/pkgs/build-support/buildenv/default.nix
+++ b/pkgs/build-support/buildenv/default.nix
@@ -109,7 +109,7 @@ lib.makeOverridable (
           ;
         pathsToLinkJSON = builtins.toJSON pathsToLink;
         pkgs = builtins.toJSON chosenOutputs;
-        extraPathsFrom = lib.optional includeClosures (writeClosure pathsForClosure);
+        extraPathsFrom = lib.optionalString includeClosures (writeClosure pathsForClosure);
         preferLocalBuild = true;
         allowSubstitutes = false;
         # XXX: The size is somewhat arbitrary