If you are using STLport v4, it is recommended that you migrate to the latest version of Standard C++ Library (STLport v5 ) available from Symbian^3 to make use of it's latest features.
To migrate to STLport v5, application developers can retain the existing sources, but must make changes to the MMP files. More than just linking against STLport v5, application developers can make use of latest features available from STLport v5 onwards and also make use of tools support added in Symbian^3.
Note: For more information about using STLport v5 on Symbian platform, see Standard C++ Support on Symbian Platform.