The code is filled with traces of Win32 + MinGW. But it's been some time, since the last MinGW compile, I think.

• It doesn't compile, out of the box. (Easy fix.)
• Functions like dns_resconf_local, dns_hosts_local doesn't work on Windows. "/etc/resolv.conf" anyone? And there're no hints on what to do instead. (I copied the files from my Linux. It seemed easier that figuring out how to hack the functions.)
• dns_poll has a faulty assert, that breaks the program. You could argue that this is an issue in MinGW. But it's not a useful assert anyway, so.