From 12dd72645a4be96f1feb422ce41f2cd14c72ced3 Mon Sep 17 00:00:00 2001
From: Takatoshi Kondo <redboltz@gmail.com>
Date: Mon, 12 Jan 2026 13:45:19 +0900
Subject: [PATCH] Add old style find boost applying option to cmake. When cmake
 has -D MSGPACK_BOOST_USE_OLD_CMAKE=ON option, cmake use old style find boost.

---
 CMakeLists.txt              | 4 +++-
 appveyor.yml                | 1 +
 test-install/CMakeLists.txt | 2 +-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f9a733c1b..8f6d54ca5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -67,7 +67,9 @@ ENDIF ()
 IF (MSGPACK_USE_BOOST)
     IF ((CMAKE_VERSION VERSION_GREATER 3.30) OR
         (CMAKE_VERSION VERSION_EQUAL 3.30))
-        CMAKE_POLICY(SET CMP0167 NEW)
+        IF (NOT MSGPACK_BOOST_USE_OLD_CMAKE)
+            CMAKE_POLICY(SET CMP0167 NEW)
+        ENDIF ()
     ENDIF ()
     SET (Boost_USE_MULTITHREADED ON)
 
diff --git a/appveyor.yml b/appveyor.yml
index 3385097ad..c0ec57bc8 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -41,6 +41,7 @@ build_script:
           $env:cpp11 `
           -D MSGPACK_BUILD_EXAMPLES=ON `
           -D MSGPACK_BUILD_TESTS=ON `
+          -D MSGPACK_BOOST_USE_OLD_CMAKE=ON `
           -D CMAKE_EXE_LINKER_FLAGS=/LIBPATH:"$env:boost_prefix\$env:boost_subdir" `
           -D CMAKE_PREFIX_PATH="$env:boost_prefix;$env:APPVEYOR_BUILD_FOLDER\zlib-1.3.1\prefix" `
           -D CMAKE_INSTALL_PREFIX="$env:APPVEYOR_BUILD_FOLDER\prefix" `
diff --git a/test-install/CMakeLists.txt b/test-install/CMakeLists.txt
index 874198b61..16ff9d38f 100644
--- a/test-install/CMakeLists.txt
+++ b/test-install/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.5...4.0)
 
 project(test-install LANGUAGES CXX)