Reggae: a metabuild system in D (Daniel, you should read this). Now with more dub. And package builds.

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https://github.com/atilaneves/reggae/issues

I think this is all I would want before considering to try reggae 
as my main build system. Concept worked pretty good so far and I 
feel very satisfied with what we can potentially get from it - 
though, I must admit, I haven't tried to port any of more 
advanced makefiles to it.

I'd suggest to try reimplementing DMD/Phobos makefiles with 
reggae once you are confortable with a design to see if it really 
works up to expectations. These contain some rather nasty rule 
mess and can serve as both great playground for checking design 
choices and selling point in improving simplicity / clarity.