Do you have experience in coding VxWorks? Experience with C?
Do you use a cross compiler toolchain (apparently you're working on windows)?
Why don't you use the dhcpd being delivered with VxWorks or an existing dhcpd port?

A dhcpd works on an OS-dependent layer, therefore porting it might not be an easy task. If you already stumble on some different data structures that way I'm afraid you wont get it done successfully.