Well, watching it on github I mean.
But of course I will try it out.

EDIT:
I'm trying it out right now (Currently in Windows 7), and I had to remove the "FUNK_PATH," part from line 23 in the test file named "funk.z80".
Then it compiled just fine. The reason for this problem was that for some reason Windows kept expecting the file to be in a previous (?) directory and not in the one that the file is in. So it was trying to find funk\... instead of just the ... .
So, I guess it's just something that went wrong with the test, but I don't seem to have the same problem with the .bat file so I might be the one missing something here..
Anyway, gonna keep on testing, and am also trying to work out how to get Atom to have better syntax-highlighting.

EDIT 2:
Trying it out on my Ubuntu installation now, and I have the same problem when I don't run it with your build script.
I do find that somewhat strange..