From f18e60d4ed03fa2e4db9fd02c38064718ab0f49f Mon Sep 17 00:00:00 2001
From: Fabian Affolter <mail@fabian-affolter.ch>
Date: Wed, 8 Apr 2026 12:24:12 +0200
Subject: [PATCH] python3Packages.arc4: modernize

---
 pkgs/development/python-modules/arc4/default.nix | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/pkgs/development/python-modules/arc4/default.nix b/pkgs/development/python-modules/arc4/default.nix
index dbeec5c0df60..2f50d18d0100 100644
--- a/pkgs/development/python-modules/arc4/default.nix
+++ b/pkgs/development/python-modules/arc4/default.nix
@@ -3,20 +3,23 @@
   buildPythonPackage,
   fetchFromGitHub,
   pytestCheckHook,
+  setuptools,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "arc4";
   version = "0.5.0";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "manicmaniac";
     repo = "arc4";
-    rev = version;
+    tag = finalAttrs.version;
     hash = "sha256-kEgyZQmVdOmD/KkmEKxgZb9Hj0jGJswCJI7Np5TI1K4=";
   };
 
+  build-system = [ setuptools ];
+
   nativeCheckInputs = [ pytestCheckHook ];
 
   pythonImportsCheck = [ "arc4" ];
@@ -24,7 +27,7 @@ buildPythonPackage rec {
   meta = {
     description = "ARCFOUR (RC4) cipher implementation";
     homepage = "https://github.com/manicmaniac/arc4";
-    license = with lib.licenses; [ bsd3 ];
+    license = lib.licenses.bsd3;
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})