From e938b1e247f8ae9ba8aa214d680bfac056998deb Mon Sep 17 00:00:00 2001
From: Martin Joerg <martin.joerg@gmail.com>
Date: Mon, 6 Oct 2025 11:54:36 +0000
Subject: [PATCH] espeak-ng: fix build with ucdSupport against CMake >= 4.0

---
 pkgs/applications/audio/espeak-ng/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/applications/audio/espeak-ng/default.nix b/pkgs/applications/audio/espeak-ng/default.nix
index 71aa235bd663..0afba656b601 100644
--- a/pkgs/applications/audio/espeak-ng/default.nix
+++ b/pkgs/applications/audio/espeak-ng/default.nix
@@ -47,6 +47,11 @@ let
 
     sourceRoot = "${src.name}/src/ucd-tools";
 
+    # fix compatibility with CMake (https://cmake.org/cmake/help/v4.0/policy/CMP0000.html)
+    postPatch = ''
+      echo 'cmake_minimum_required(VERSION 4.0)' >> CMakeLists.txt
+    '';
+
     nativeBuildInputs = [ cmake ];
 
     installPhase = ''