ctranslate2: fix CMake 4 compatibility with patch file

Adds a patch file to update cmake_minimum_required from 3.7 to 3.10 in
the main CMakeLists.txt files. Keeps the existing postPatch for vendored
dependencies since those are git submodules that can't be easily patched
with patch files.

CMake 4 doesn't support versions older than 3.5, and versions between
3.5-3.10 are deprecated.

Upstream is working on a similar fix in OpenNMT/CTranslate2#1907

Fixes: NixOS#450258
Signed-off-by: Dave Walker <[email protected]>

Author: Daviey

pkgs/by-name/ct/ctranslate2/cmake-3.10.patch

@@ -0,0 +1,44 @@
+From 5aca1c2147825420dca2d69d0338a616755d38dc Mon Sep 17 00:00:00 2001
+From: Dave Walker <[email protected]>
+Date: Thu, 9 Oct 2025 15:14:54 +0100
+Subject: [PATCH] Update CMake minimum required version to 3.10
+
+CMake 4 removed compatibility with CMake versions < 3.5, and versions
+between 3.5-3.10 are deprecated.
+
+This change updates the minimum required version to 3.10 to ensure
+compatibility with modern CMake versions including CMake 4.x.
+
+This issue is affecting NixOS users (see
+https://github.com/NixOS/nixpkgs/issues/450258) and will likely impact
+other distributions as they upgrade to CMake 4.x.
+
+Inspired by: https://github.com/OpenNMT/CTranslate2/pull/1907
+---
+ CMakeLists.txt                   | 2 +-
+ examples/wngt2020/CMakeLists.txt | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 62b99d1..ecc085c 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required(VERSION 3.7)
++cmake_minimum_required(VERSION 3.10)
+ 
+ # Set policy for setting the MSVC runtime library for static MSVC builds
+ if(POLICY CMP0091)
+diff --git a/examples/wngt2020/CMakeLists.txt b/examples/wngt2020/CMakeLists.txt
+index d0a527d..da1e57d 100644
+--- a/examples/wngt2020/CMakeLists.txt
++++ b/examples/wngt2020/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required(VERSION 3.7)
++cmake_minimum_required(VERSION 3.10)
+ project(wngt2020)
+ set(CMAKE_CXX_STANDARD 11)
+ set(CMAKE_BUILD_TYPE Release)
+-- 
+2.51.0
+

pkgs/by-name/ct/ctranslate2/package.nix

@@ -38,7 +38,14 @@ stdenv'.mkDerivation (finalAttrs: {
     hash = "sha256-EM2kunqtxo0BTIzrEomfaRsdav7sx6QEOhjDtjjSoYY=";
   };
 
-  # Fix CMake 4 compatibility
+  patches = [
+    # Update CMake minimum required version for CMake 4 compatibility
+    # https://github.com/NixOS/nixpkgs/issues/450258
+    # Inspired by: https://github.com/OpenNMT/CTranslate2/pull/1907
+    ./cmake-3.10.patch
+  ];
+
+  # Fix CMake 4 compatibility in vendored dependencies (submodules)
   postPatch = ''
     substituteInPlace third_party/cpu_features/CMakeLists.txt \
       --replace-fail \