gcc.compile.c++ bin.v2/libs/filesystem/build/gcc-4.1.2/debug/threading-multi/path.o libs/filesystem/src/path.cpp: In static member function ‘static std::string boost::filesystem::wpath_traits::to_external(const boost::filesystem::wpath&, const std::wstring&)’: libs/filesystem/src/path.cpp:128: error: ‘system_category’ was not declared in this scope libs/filesystem/src/path.cpp: In static member function ‘static std::wstring boost::filesystem::wpath_traits::to_internal(const std::string&)’: libs/filesystem/src/path.cpp:147: error: ‘system_category’ was not declared in this scope "g++" -ftemplate-depth-128 -O0 -fno-inline -Wall -g -fPIC -pthread -DBOOST_ALL_DYN_LINK=1 -DBOOST_ALL_NO_LIB=1 -DBOOST_SYSTEM_DYN_LINK=1 -I"." -c -o "bin.v2/libs/filesystem/build/gcc-4.1.2/debug/threading-multi/path.o" "libs/filesystem/src/path.cpp"C