Sorry, my previous statement was perhaps a little ambiguous. I download and installed the whole Qt SDK for Windows (under Wine), which has MinGW and Qt libs bundled in it as well. Do you think that will work? (Obviously, with the caveat that I have to get it to run first!)

I'm just being lazy really, I thought that this might be a relatively simple way to build small executables for Windows under Linux. I had a brief look at MinGW cross-compiling for Windows in Linux, but it looked like a lot of new things to learn!