ostrstream problem

["Ernest L. Williams Jr." <ernesto@xxxxxxxx>]

Hi,

I am now using gcc 4.0.1.

I get the following error:
====================================================
error: ‘ostrstream’ was not declared in this scope
===================================================


What header must I use to get ostrstream?

I tried : #include <sstream>

I am confused. 
Any help or reference is welcomed and appreciated.



Thanks,
Ernest L. Williams Jr.