From 94eaa2257a6038ceffe4e440725cea590d6ede5f Mon Sep 17 00:00:00 2001
From: Kai-Uwe Hermann <kai-uwe.hermann@pionix.de>
Date: Wed, 29 Oct 2025 20:52:05 +0100
Subject: [PATCH 1/2] Add compatibility with Boost 1.89

Only add Boost.system to link libraries for version < 1.69 where it is not a header only library

Signed-off-by: Kai-Uwe Hermann <kai-uwe.hermann@pionix.de>
---
 CMakeLists.txt     | 9 ++++++++-
 lib/CMakeLists.txt | 6 +++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 13b475e1..0cdd5e6e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,11 +43,18 @@ list(INSERT CMAKE_MODULE_PATH 0 "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 find_package(Boost
     COMPONENTS
         program_options
-        system
         thread
     REQUIRED
 )
 
+if(Boost_VERSION_STRING VERSION_LESS "1.69.0")
+    find_package(Boost
+        COMPONENTS
+            system
+        REQUIRED
+    )
+endif()
+
 find_package(PkgConfig REQUIRED)
 pkg_check_modules(libcap
     REQUIRED
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 5018dfd8..a0288315 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -63,6 +63,10 @@ target_include_directories(framework
         $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/everest>
 )
 
+if(Boost_VERSION_STRING VERSION_LESS "1.69.0")
+    set(EVEREST_FRAMEWORK_BOOST_SYSTEM_LINK_LIBRARY Boost::system)
+endif()
+
 target_link_libraries(framework
     PUBLIC
         date::date-tz
@@ -74,7 +78,7 @@ target_link_libraries(framework
         everest::sqlite
         ${STD_FILESYSTEM_COMPAT_LIB}
     PRIVATE
-        Boost::system
+        ${EVEREST_FRAMEWORK_BOOST_SYSTEM_LINK_LIBRARY}
         Boost::thread
         Boost::program_options
         mqttc

From a017aff03e60ed97e08f03477d295614eecc8faf Mon Sep 17 00:00:00 2001
From: Kai-Uwe Hermann <kai-uwe.hermann@pionix.de>
Date: Wed, 29 Oct 2025 20:56:19 +0100
Subject: [PATCH 2/2] Set CMake policy 167 to OLD to keep uswing the removed
 FindBoost module

Signed-off-by: Kai-Uwe Hermann <kai-uwe.hermann@pionix.de>
---
 CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0cdd5e6e..e8744d21 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,6 +39,11 @@ endif()
 # make own cmake modules available
 list(INSERT CMAKE_MODULE_PATH 0 "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
+# this policy allows us to continue using the removed FindBoost module for now
+if(POLICY CMP0167)
+    cmake_policy(SET CMP0167 OLD)
+endif()
+
 # dependencies
 find_package(Boost
     COMPONENTS