I like the focus on simplicity, staying with C and no other requirements, and the choice of Lua. I'm a casual user of CMake but not too enthused about it, so I'll give this a try. Honestly I don't know if static typing is that important for me in this particular use case. I may just rummage through the codebase to see if I can extract a few choice funcionality.

I always wonder why use a DSL while you can just borrow some existing PL?

It seems like this was built years ago but only posted now. Why post it now? It doesn’t seem like it has changed much in 4 years so I can’t see that it matured or stabilized over that time. I am sorry for my ignorance of c build systems, this very well might be in high use already. Either way, it looks useful and built by hand so good job! Looks great and I hope people find it useful!