It's time to test our implementation or redo by converting an existing make-based build system over to it. I've picked redis as our target due to its relatively simple Makefile and its avoidance of automake. Along the way, we'll fix a couple problems with our current implementation. WARNING: No new Haskell concepts are introduced in this video and very little code is written. Skip to episode 11 if you're not interested in build systems. Skip to 7:17 to get right to the Haskell code changes. Links from the video: http://redis.io/ https://github.com/jekor/redis Follow along on GitHub at https://github.com/jekor/redo Notices and updates on Twitter at @jekor https://twitter.com/jekor All Haskell from Scratch videos:    • Haskell from Scratch