From a25412306539e7ecefeb0dc81ca9c6e07b87636a Mon Sep 17 00:00:00 2001
From: Sergei Zimmerman <xokdvium@proton.me>
Date: Mon, 26 May 2025 20:19:04 +0000
Subject: [PATCH] flutter: optimize evaluation of appBuildDeps

---
 pkgs/development/compilers/flutter/wrapper.nix | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/pkgs/development/compilers/flutter/wrapper.nix b/pkgs/development/compilers/flutter/wrapper.nix
index 57f945477f41..8b5d38393b47 100644
--- a/pkgs/development/compilers/flutter/wrapper.nix
+++ b/pkgs/development/compilers/flutter/wrapper.nix
@@ -103,11 +103,19 @@ let
     let
       # https://discourse.nixos.org/t/handling-transitive-c-dependencies/5942/3
       deps =
-        pkg:
-        builtins.filter lib.isDerivation ((pkg.buildInputs or [ ]) ++ (pkg.propagatedBuildInputs or [ ]));
-      collect = pkg: lib.unique ([ pkg ] ++ deps pkg ++ builtins.concatMap collect (deps pkg));
+        pkg: lib.filter lib.isDerivation ((pkg.buildInputs or [ ]) ++ (pkg.propagatedBuildInputs or [ ]));
+      withKey = pkg: {
+        key = pkg.outPath;
+        val = pkg;
+      };
+      collect = pkg: lib.map withKey ([ pkg ] ++ deps pkg);
     in
-    builtins.concatMap collect appRuntimeDeps;
+    lib.map (e: e.val) (
+      lib.genericClosure {
+        startSet = lib.map withKey appRuntimeDeps;
+        operator = item: collect item.val;
+      }
+    );
 
   # Some header files and libraries are not properly located by the Flutter SDK.
   # They must be manually included.