Hi John, I applied your seven changes and three other changes namely: 1. A work-around for std::basic_ostream::sentry's explicit operator bool() in Boost.Log. 2. Removed usage of -xldscope=hidden in Boost.Lexical_Cast. 3. Removed usage of -xldscope=hidden in Boost.Variant. After all the above changes, these are the remaining prevalent problems that I have observed: 1. "libs/thread/src/pthread/thread.cpp", line 144: Error: Overloading ambiguity between "boost::call_once<void(*)()>(boost::once_flag&, void(*)())" and "boost::call_once<void(&)()>(boost::once_flag&, void(&)())". 2. "./boost/thread/once.hpp", line 38: Error: Overloading ambiguity between "boost::call_once<void(*)()>(boost::once_flag&, void(*)())" and "boost::call_once<void(*)()&>(boost::once_flag&, void(*)()&)". 3. "./boost/thread/pthread/once_atomic.hpp", line 168: Error: Overloading ambiguity between "boost::detail::invoke<void, void(*)(rlimit*), rlimit*>(void(*)(rlimit*)&, rlimit*)" and "boost::detail::invoke<void, void(*)(rlimit*), rlimit*&>(void(*)(rlimit*)&, rlimit*&)". 4. "./boost/proto/detail/preprocessed/make_expr_.hpp", line 73: Error: type is not a member of boost::proto::transform<boost::proto::switch_<boost::phoenix::phoenix_generator, boost::proto::tag_of<boost::proto::_>()>, void>::result<boost::phoenix::phoenix_generator(boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::assign, boost::proto::argsns_::list2<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::phoenix::argument<1>>, 0>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::phoenix::argument<1>>, 0>>>, 2>)>. 5. "libs/python/src/converter/builtin_converters.cpp", line 474: Error: Overloading ambiguity between "std::complex<double>::complex(double, double)" and "std::complex<double>::complex(complex double[2])". Problems 1 and 2 appear to be similar but they have slightly different signatures. Problems 2 and 3 appear to be related. Regards, Leo