I see the following error when compiling Boost 1.60 in develop branch with Oracle Solaris Studio development compiler with -library=stlport4. "CC" -compat=5 -library=stlport4 -temp=/tmp/bn -xO4 -mt -erroff=%none -m32 -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I".." -c -o "/export/home/sstrunk-tester/boost_regression/boost_regression_develop/boost_sparc-S2_stlport4/results/boost/bin.v2/libs/serialization/build/sun-next_stlport4/release/link-static/threading-multi/basic_text_iprimitive.o" "../libs/serialization/src/basic_text_iprimitive.cpp" "../boost/archive/basic_streambuf_locale_saver.hpp", line 75: Error: sync is not a member of std::ios . "../boost/archive/impl/basic_text_iprimitive.ipp", line 112: Where: While instantiating "boost::archive::basic_ios_locale_saver<char, std::char_traits<char>>::~basic_ios_locale_saver()". "../boost/archive/impl/basic_text_iprimitive.ipp", line 112: Where: Instantiated from boost::archive::basic_text_iprimitive<std::istream>::basic_text_iprimitive(std::istream &, bool). "../libs/serialization/src/basic_text_iprimitive.cpp", line 25: Where: Instantiated from non-template code. 1 Error(s) detected. This seems to prevent building libboost_serialization.so.1.60.0, and a recent regression after changes to the serialization library. Thanks, Aparna