The biggest problem I see with the article is that you didn't say exactly what you're doing with this build system. And this gets people's imagination going.

What is the scope? Is this an open source project? How many people are working with it?

To me it looks like this is a personal project that only you are working on. I don't see any problem using this approach. I mean, I use a batch file as my build "system" for my personal projects. But for anything else it would be worth discussing the trade-offs versus using one of the available build systems.

I didn't understand how this works: scanCmd = 'scanincludes-%s' %(oPath). What is this scanincludes thing?