The ANSI/ISO C++ specifcation includes a standard C++ library, also known as
the STL. GCC by default comes with an implementation that does not comply
with this standard, but instead partly implements an older version. STLport
is freely available version, based on the SGI STL implementation. It is
fully-compliant, supported, and very fast. Includes special debugging
facilities, and interesting and useful extensions to the standard.