Fix build with boost-1.89.0
From: https://codeberg.org/shelter/reschroot/issues/33

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)