[Dev-C++] Get socket with socket function

Hi all,

I managed to compile a simple program that should just wait for an 
icoming connection on a inet type socket. I did it under Mac OS X and 
Linux, and I want to do the same thing with dev-cpp.

Due to explanation give on this mailing list (thanks for your quick and 
usefull answers), I change the code to use winsock.h instead of 
sys/socket.h. I added the necessary library and DLLs. The program 
starts correctly and get it the function to create the socket file 
descriptor (it is very simple) :

int sockfd;

sockfd = socket(AF_INET, SOCK_STREAM, 0);

BUT the result of socket function is always -1 (sockfd = -1). What 
could  be the cause of that ? I found a similar example of socket 
creation for windows, I did exactly the same as in the example. The 
only thing I have found in "socket" man page is :

"A -1 is returned if an error occurs"

But how can an error happen at this step ?

Thank you for any advice.

Best regards.