Compile for other OS's on Windows?

[Bauss via Digitalmars-d-learn]

On Monday, 5 January 2015 at 12:54:00 UTC, Gary Willoughby wrote:
> On Monday, 5 January 2015 at 11:49:32 UTC, Bauss wrote:
>> Is it possible to compile for other OS's on Windows using dmd?
>
> This is what's known as cross compiling and is not currently 
> supported by DMD at this time.

Any alternatives?