Thread: wostringstream... what header?

Simple question with, hopefully, a simple answer...
what headers/preprocessor directives should I use to be able to use wostringstream, wostream, etc?
I've got both the iostream and sstream headers included and ostringstream and ostream work just fine, but I can't seem to get to wostringstream to work; they simply undeclared and I can't seem to find anything about it through Google or the forum search.
I'm using DevCpp 4.9.9.2 with Mingw/GCC 3.4.2, programming under Windows XP.
Thanks in advance.

Code:

#include <ostream>

void testfunction( std::wostream &testvar )
{
}

int main(int argc, char *argv[])
{
  return 0;
}

Errors:

3 C:\Test\main.cpp `wostream' undeclared in namespace `std'
3 C:\Test\main.cpp `testvar' was not declared in this scope
4 C:\Test\main.cpp variable or field `testfunction' declared void
4 C:\Test\main.cpp syntax error before `{' token
C:\Test\Makefile.win [Build Error] [main.o] Error 1

MinGW has a known lack of support for wide-character versions of the C++ standard library stuff. You can use the STLport C++ standard library as a replacement for the library MinGW comes with. That would gain you these components.

I was sort of afraid it'd come to this... this is quite a setback.
Thanks for the info and help. I'll give STLport a go, although installing it to work with Dev-C++ seems rather daunting at the moment, so for now I'll just use an alternative solution not involving streams.