Seems like I jumped the gun here ;-). Since I consider it a great waste of time to get, build, and integrate any third party libraries, and my main goal is to work through the book, I stubbed the rLog stuff upfront. The result is extremely simple and consists of three headers.
(I realize that, if you were working on the legacy code, you would probably have everything in place already, so the approach mentioned in chapter 8 is actually very helpful for that situation).
So, here goes: