undefined reference to ..

[lhovo]

I'm getting errors when trying to use this as a library inside Arduino Version 1.0.3

Arduino/libraries/msgpack/msgpack/unpack_template.h:261: undefined reference to 'ntohl'
Arduino/libraries/msgpack/msgpack/unpack_template.h:270: undefined reference to 'ntohs'

Thoughts on how to fix this?

Cheers