Windows ODBC Driver

I've used the Windows ODBC driver Installer on:

    http://freetds.sourceforge.net 

with great success.  It installs a 0.64 driver, so I wanted to look into 
compiling my own with the latest source.  

My problem is that I develop on a Mac.  I don't have access to a Windows 
machine with a compiler.

So: can I, using only freely and legally downloadable tools, cross-compile 
and create a Windows ODBC driver like the one the installer above installs 
on  my Mac (Intel).  (I've already build the Mac ODBC drivers--easy!)

Or if I were to borrow a Windows machine, what tools (free ones)  would 
people recommend I load on it to do it?

I'd really rather do this on the Mac if it's doable.  

I apologize if this has been answered many times before, I *did* read 
the archives for about two hours before posting.

Many thanks,
John