Undeclared wstring/wcout in GCC under DJGPP/Cygwin

[ing. Jan Chládek]

I need compile ANSI C++ source file under Windows XP.
For some reasons I can't use MS Visual Studio, then I trying g++ port for 
Windows (DJGPP, CygWin).
But I've problems with wide-characters operations, I think then it's maybe 
error of compiler's port for Windows.

Simple sample a.cpp:

#include <string>
#include <iostream>
using namespace std;
int main (int argc, char * argv[]) {
    wstring x;
    wcout<<x;
    return 0;
}

I've got these error messages:

1) in DJGPP 2.03, gxx 3.4.3
a.cpp: In function `int main(int, char**)':
a.cpp:5: error: `wstring' undeclared (first use this function)
a.cpp:5: error: (Each undeclared identifier is reported only once for each
function it appears in.)
a.cpp:5: error: expected `;' before "x"
a.cpp:6: error: `wcout' undeclared (first use this function)
a.cpp:6: error: `x' undeclared (first use this function)

2) in cygwin 1.5.13, g++ 3.3.3
a.cpp: In function `int main(int, char**)':
a.cpp:5: error: `wstring' undeclared (first use this function)
a.cpp:5: error: (Each undeclared identifier is reported only once for each
function it appears in.)
a.cpp:5: error: parse error before `;' token
a.cpp:6: error: `wcout' undeclared (first use this function)
a.cpp:6: error: `x' undeclared (first use this function)

3) in RedHat Linux, g++ 3.2.3
Compiled correctly.

Do you somebody know how to compile sources with wide-character strings 
until g++ for Windows?
Or exists any other free (full ANSI) C++ compiler for Windows?

Thanks