Thread support in cygwin!

[Do Nguyen Luong <do_luong87 at yahoo dot com>]

Hi, I'm trying to port a program used pthread in Linux to Windows.In cygwin,
I compiled it but when executing I got this message : Threads are not
supported
In Linux, it works fine.
Then in Cygwin I write this simple program : 

#include <pthread.h>
#include <unistd.h> 
#include <stdio.h> 
int main() 
{ 
#ifdef _POSIX_THREADS 
        printf("sysconf(_SC_THREADS): %d\n", sysconf(_SC_THREADS)); 
#else 
        printf("_POSIX_THREADS not defined\n"); 
#endif 
        return 0; 
} 

And I get :
sysconf(_SC_THREADS): -1

Is that mean cygwin doesn't support threads? Or I missed some package? 

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