hent fil via C

http://www.eksperten.dk/spm/438673

Bruger koden fra ovennævnte url, og får flg. fejl :

undefined reference to `socket@12'
undefined reference to `bind@12'
undefined reference to `gethostbyname@4'
undefined reference to `connect@12'
undefined reference to `send@16'
undefined reference to `recv@16'
undefined reference to `recv@16'
undefined reference to `closesocket@4'
undefined reference to `WSAStartup@8'
undefined reference to `WSACleanup@0'

Hvad sker der? :S Er totalt ikke-inde i C.. hjælp mig! :D