Building from source on Windows

[forkit]

No matter what instructions, blogs, articles... I use.. I simply 
cannot manage to build druntime,dmd,phobos, from source on 
Windows.

Of course, building from source in linux is a breeze.

But I cannot test my changes on Windows, cause I cannot build 
from source on Windows!

Does anyone have a step-by-step process, that is 'guaranteed' to 
work? (with as few unnecessary dependencies as possible please).

I'm happy to build a dedicated build machine for this purpose, 
with just the software needed to build from source.

NOTE: I said 'guaranteed' to work ;-)  ... I've wasted to much 
time following instructions that just do not work.