From 491cf0ca21eed806f491fb43c120a7f7d0d6b4fb Mon Sep 17 00:00:00 2001
From: Sylvain Lefebvre <sylvain.lefebvre@inria.fr>
Date: Sun, 12 Apr 2026 12:56:14 +0200
Subject: [PATCH] cmake: adding an existence check around FindBoost policy
 (CMP0167) to avoid build errors on older versions

---
 libgm/CMakeLists.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libgm/CMakeLists.txt b/libgm/CMakeLists.txt
index 06a02a6..ccde502 100644
--- a/libgm/CMakeLists.txt
+++ b/libgm/CMakeLists.txt
@@ -1,7 +1,10 @@
 cmake_minimum_required(VERSION 3.13)
 project(libgatemate)
 
-cmake_policy(SET CMP0167 NEW)
+if (POLICY CMP0167)
+  # The existence check above avoids breaking the build on older cmake versions
+  cmake_policy(SET CMP0167 NEW)
+endif()
 
 option(BUILD_SHARED "Build shared GateMate library" OFF)
 option(STATIC_BUILD "Create static build of GateMate tools" ON)