Boost.System no longer has a library.

--- v3.10.12.0/cmake/Modules/GrBoost.cmake	2024-12-15 16:26:20.000000000 +0000
+++ v3.10.12.0/cmake/Modules/GrBoost.cmake	2025-08-15 03:39:26.260413686 +0100
@@ -14,7 +14,7 @@
 # Setup Boost and handle some system specific things
 ########################################################################
 
-set(BOOST_REQUIRED_COMPONENTS date_time program_options system regex thread)
+set(BOOST_REQUIRED_COMPONENTS date_time program_options regex thread)
 
 if(UNIX
    AND NOT BOOST_ROOT
--- v3.10.12.0/cmake/Modules/GnuradioConfig.cmake.in	2024-12-15 16:26:20.000000000 +0000
+++ v3.10.12.0/cmake/Modules/GnuradioConfig.cmake.in	2025-08-15 06:12:19.813430213 +0100
@@ -13,7 +13,7 @@
 find_dependency(spdlog)
 find_dependency(MPLIB)
 
-set(BOOST_REQUIRED_COMPONENTS date_time program_options system regex thread)
+set(BOOST_REQUIRED_COMPONENTS date_time program_options regex thread)
 
 if(NOT ENABLE_TESTING)
     set(ENABLE_TESTING