[Dev-C++] O_WRONLY, O_RDONLY unrecognized

Does anybody know why the compiler doesn't recognize O_WRONLY, O_RDONLY, ...
in function "open"?

I get the error "12 c:\prova.c `O_WRONLY' undeclared (first use in this
function)",
but I think it sould work if including unistd.h and fcntl.h, isn't it?

-----------------------------


#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
    char buffer[1024] ;
    int fd,i,j,k ;
    
    memset(&buffer,'a',1024) ;
    
    fd = open("./prova",O_WRONLY) ;

    for (i=1; i<=2;i++)
    {
        printf("El valor de %d\n",i) ;
        for (j=1; j<=5;j++)
          write(fd,buffer,1024) ;
     }
    close(fd) ;

  system("PAUSE");
  return 0;
}


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