Could you please give some tips if I'm in the rigth path....

I saw the 'Mach-O' tag and find out that I need an OS X to execute the file.

Tried to download Pure Darwin to run in my virtual box, but didn't manage to make it run....

I'm wondering if I really need an OS X to finish the task or there's another way...

thank you so much!

And I appreciate all the trouble you guys had to create this awesome platform we can learn a lot!!!