Unifying Make and Shell

General problem: do they support build variants in multiple output dirs? For example, I believe this is hard/mipossible with the redo model, and I don't like tons of tiny shell scripts.

• redo

• danfuzz/blur -- Blur is a very small and simple target-driven (top-down) build system, with (practically speaking) no dependencies: It is written entirely as a small handful of Bash scripts, totalling about 1,200 lines.

• setup.shl - A simple Bash library for setting up a directory structure using Makefile-like definitions

• akkartik/basic-build -- I believe one person pointed out the fact that the author has to topologically sort the definitions themselves.