Are you restricted by make-based build systems? Frustrated with slow incremental builds or incorrect builds? I've designed tup to fix the inherent limitations with make and make-like build systems. You can read more about the design in my paper: http://gittup.org/tup/build_system_rules_and_algorithms.pdf

Whether your own work is open source or proprietary, you can use tup for free to build your projects. Your contribution here supports my work and is very much appreciated.