I added #include <ios>, which is apparently missing.
Is there flag that separate standard/classic iostream (If I guess correctly - it should be enough)
#ifndef BOOST_NO_STD_LOCALE #include <ios> #endif
John. (I also need to make the same fix!).
It's quite obscure variable name for something very simple : switch classic/standard io. If you search through boost source you will see: 1. Check like "#if defined(__GNUC__) && (__GNUC__ < 3)" in boost/shared_ptr.hpp, boost/intrusive_ptr.hpp, boost/math/octonion.hpp boost/math/quaternion.hpp (which is incorrect BTW IMO since gcc2.95 could be using STLPort) 2. #ifndef BOOST_NO_TEMPLATE_STD_STREAM in boost/format/free_funcs.hpp and others Look also in boost/format/detail/workarounds_gcc-2.95.hpp that contains detailed workaround for gcc2.95 without STLPort 3. #if __GNUC__ < 3 in graph/detail/edge.hpp (the same comment applies as in 1.) 4. #ifdef BOOST_NO_TEMPLATED_STREAMS in boost/lambda/detail/operators.hpp and others, and Boost.Tuple headers 5. #ifdef BOOST_UBLAS_USE_BASIC_STREAM and #ifdef BOOST_UBLAS_USE_STREAM in ublas code 6. #ifndef BOOST_NO_STD_LOCALE in boost.random/detail/... several headers, Boost.Regex, 7. #if BOOST_WORKAROUND(__GNUC__, < 3) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION) In Boost.Test headers 8. Boost.Variant present workarounds based on #if !defined(BOOST_NO_STD_LOCALE) in boost/detail/templated_streams.hpp 9. #ifdef BOOST_OLD_IOSTREAMS in boost/dynamic_bitset/dynamic_bitset.hpp 10. # if !defined(BOOST_IOFM_NO_BASIC_STREAM) in output formatters library currently under review. Also you could see that std::basic_ostream is used outside #ifndef BOOST_NO_STD_LOCALE and many other places where standard iostreams are used without any checks. I believe we need to put stop to this mess and force everybody use the same practice/variable(s). My vote is for BOOST_CLASSIC_IOSTREAMS, BOOST_STANDARD_IOSTREAMS. Regards, Gennadiy.