No calls to shell, no external binaries executed, just pure [BSD] Makefiles rendering my favorite fractal.

bmake (AKA BSD make) is the implementation of make(1) used by BSD operating systems. It does not support basic arithmetic, it doesn't have infinite loops, no floating point support, but I forced it to render a fractal anyways :) . To use BSD make on Linux, search your package manager for "bmake", install it, and run `bmake` inside the cloned repo instead of `make`.