Hi, There's a problem with noncopyable and boost::unit_test::singleton in Intel 13 for Linux in C++11 compatibility mode that's rippling through many Boost libs. To list a few: date_time: http://tinyurl.com/lkeakab geometry: http://tinyurl.com/n3rajyn regex: http://tinyurl.com/kxkqo4c tuple: http://tinyurl.com/oz3vlct The error messages go like protected function "boost::noncopyable_::noncopyable::noncopyable()" [...] is not accessible through a "boost::noncopyable_::noncopyable" pointer or object[...] protected function "boost::unit_test::singleton<Derived>::singleton()" [...] is not accessible through a "boost::unit_test::singletonboost::unit_test::unit_test_log_t" pointer or object[...] which are manifestations of the following compiler bug: https://software.intel.com/en-us/forums/topic/404755 The report also indicates a simple workaround consisting of replacing BOOST_CONSTEXPR noncopyable() = default; with noncopyable() {} (seemingly, this would also fix boost::unit_test::singleton automatically.) Maybe the maintainer of boost:noncopyable can try a fix for ICC 13 along these lines? This can potentially clear a ton of yellow cells. I'd volunteer a pull request but alas I don't have local access to that compiler. Thank you, Joaquín M López Muñoz Telefónica