The term STL is not mentioned in the C++ ISO standard.
It seems that it was once a separate library which heavily influenced the C++ ISO standrad when it was created.
http://stackoverflow.com/questions/5205491/whats-this-stl-vs-c-standard-library-fight-all-about
Therefore: never use that word, unless you are really talking about the non stdlib library which has had most of its functionality implemented on the stdlib.
Write stdlib and say "Standard Library" instead.
GCC comes with an implementation of libstdc++.
It is the main Linux implementation.
Shared object name: libstdc++.so.
Website: http://gcc.gnu.org/libstdc++/
Get source code: seems to be on the same tree as gcc?
git clone git://gcc.gnu.org/git/gcc.git
Find the shared library:
locate libstdc++
Common location on Linux:
/usr/lib/ARCH-linux-gnu/libstdc++.so.X
Locate the headers
locate /iostream
Common location:
/usr/include/c++/4.X/`.
The Ubuntu package is called libstdc++6.X. dpkg -l | grep libstd.
With g++ the C++ standard library is linked against automatically. This does not happen when compiling with gcc, and is one of the many reasons why you should use g++ whenever compiling C++ instead of gcc.
Dead.
https://en.wikipedia.org/wiki/Apache_C%2B%2B_Standard_Library