From d7e922a9b10a38a6eaddb4b14689c02ce5085246 Mon Sep 17 00:00:00 2001
From: Rafael Ieda <git@ieda.me>
Date: Tue, 21 Oct 2025 13:05:04 -0300
Subject: [PATCH] kcp: fix build with cmake4

---
 pkgs/by-name/kc/kcp/package.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/by-name/kc/kcp/package.nix b/pkgs/by-name/kc/kcp/package.nix
index b939e335718e..e2733a5c925b 100644
--- a/pkgs/by-name/kc/kcp/package.nix
+++ b/pkgs/by-name/kc/kcp/package.nix
@@ -18,6 +18,11 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake ];
 
+  postPatch = ''
+    substituteInPlace CMakeLists.txt \
+      --replace-fail "CMAKE_MINIMUM_REQUIRED(VERSION 2.6)" "cmake_minimum_required(VERSION 3.10)"
+  '';
+
   meta = with lib; {
     description = "Fast and Reliable ARQ Protocol";
     homepage = "https://github.com/skywind3000/kcp";