From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Holger Hoffstätte <holger@applied-asynchrony.com>
Date: Tue, 16 Sep 2025 15:37:42 +0200
Subject: [PATCH] Fix build against Boost 1.89.0

boost-1.89.0 removed the (empty for a long time) boost_system, which is
now header-only, and cmake configuration now fails:

	CMake Error at /usr/lib/cmake/Boost-1.89.0/BoostConfig.cmake:141 (find_package):
	  Could not find a package configuration file provided by "boost_system"
	  (requested version 1.89.0) with any of the following names:

	    boost_systemConfig.cmake
	    boost_system-config.cmake

	  Add the installation prefix of "boost_system" to CMAKE_PREFIX_PATH or set
	  "boost_system_DIR" to a directory containing one of the above files.  If
	  "boost_system" provides a separate development package or SDK, be sure it
	  has been installed.
	Call Stack (most recent call first):
	  /usr/lib/cmake/Boost-1.89.0/BoostConfig.cmake:262 (boost_find_component)
	  /usr/share/cmake/Modules/FindBoost.cmake:609 (find_package)
	  CMakeLists.txt:61 (find_package)

Ref: https://codeberg.org/shelter/reschroot/issues/33
Origin: Upstream
[ismael@sourcemage.org: patch normalized and description added]
Signed-off-by: Ismael Luceno <ismael@sourcemage.org>

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 35da3380..fa4b55db 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -59,7 +59,11 @@ find_package(Threads REQUIRED)

 include(FindBoost)
 find_package(Boost REQUIRED
-             COMPONENTS filesystem system iostreams program_options regex)
+             COMPONENTS filesystem iostreams program_options regex)
+if(Boost_MAJOR_VERSION EQUAL 1 AND Boost_MINOR_VERSION LESS 69)
+  list(APPEND BOOST_REQUIRED_COMPONENTS system)
+  find_package(Boost REQUIRED COMPONENTS ${BOOST_REQUIRED_COMPONENTS})
+endif()

 # HEADER CHECKS
 include(CheckIncludeFileCXX)


.