Configure error: Cannot find a type to use in place of socklen_t

[Lisa Hickey]

Hi,
I'm using rsync with cygwin (i'm working on a windows OS) but when the config script is running i get an error - "Cannot find a type to use in place of socklen_t".

I have searched google but most of the solutions said to edit the configure file but none of their files that they are editing look like my configure file. 

Does anyone know how i might fix this error?
Thanks in advance