Hi, It seems that nearly all regression tests are failing for us in both develop and master: http://www.boost.org/development/tests/master/developer/geometry.html With the messages like: disjoint.obj : error LNK2001: unresolved external symbol "public: virtual void __cdecl boost::unit_test::output::junit_log_formatter::log_start( class std::basic_ostream &,unsigned long)" (?log_start@junit_log_formatter@output@unit_test@boost@@UEAAXAEAV?$basic_ostream@DU?$char_traits@D@std@@@std@@K@Z) We use Boost.Test (header-only), is there something changed there? Do we need to change our Jam file? (of course we want to keep it header-only). The failures are new, before my one-week holiday it was still all OK. Regards, Barend