Boost.System no longer has a library.

--- v3.3.2/CMakeLists.txt	2023-03-30 11:37:41.000000000 +0100
+++ v3.3.2/CMakeLists.txt	2025-08-15 03:41:41.374638410 +0100
@@ -90,7 +90,7 @@
 
 # Set BOOST_ROOT to help CMake to find the right Boost version
 find_package(Boost 1.49.0
-  REQUIRED date_time filesystem system iostreams regex unit_test_framework
+  REQUIRED date_time filesystem iostreams regex unit_test_framework
   ${BOOST_PYTHON} OPTIONAL_COMPONENTS nowide)
 
 # enable Boost::nowide library (for UTF8 command line args on Windows)