None it which is included by the 2 headers above. Are you sure you did not modify files locally?
No! It's trivial to reproduce with: #include <boost/test/included/test_exec_monitor.hpp> int test_main(int, char*[]) { return 0; } which outputs: $ cl -GX -I. scrap.cpp Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.10.3077 for 80x86 Copyright (C) Microsoft Corporation 1984-2002. All rights reserved. scrap.cpp Microsoft (R) Incremental Linker Version 7.10.3077 Copyright (C) Microsoft Corporation. All rights reserved. /out:scrap.exe scrap.obj LINK : fatal error LNK1104: cannot open file 'libboost_unit_test_framework-vc71- s-1_34.lib' The header inclusion backtrace is: #line 20 "c:\\data\\boost\\develop\\boost\\boost\\test\\included\\test_exec_monitor.hpp" #line 28 "c:\\data\\boost\\develop\\boost\\boost\\test\\impl\\framework.ipp" #line 1 "c:\\data\\boost\\develop\\boost\\boost\\test\\auto_unit_test.hpp" #line 34 "c:\\data\\boost\\develop\\boost\\boost\\test\\unit_test.hpp" #line 1 "c:\\data\\boost\\develop\\boost\\boost\\config\\auto_link.hpp" Clear now? John.