$NetBSD$

cmake 4 compatibility
https://github.com/docopt/docopt.cpp/issues/166

--- CMakeLists.txt.orig	2025-08-14 20:01:20.968561125 +0000
+++ CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5)
 project(docopt.cpp VERSION 0.6.2)
 
 include(GNUInstallDirs)
