Rating: 

This is much more useful.

I don't need a inrtoductory book - I've designed and implemented multiple commercial operating system build system, I'm looking for ideas on how to build better build systems.

The explanation of the kernel build system helped, and the data structures examples was truly innovative.

Its interesting to see someone expose the full power of make, most are content to write minimal and naive Makefiles, or concentate on a single program - things get more "interesting" when you have a complete multiple project suite to build.