Matplotlib (which I was intending to use for plotting the data-value graphs) turns out to be a bit of a pain to install. Looks like it's looking for the "CXX" library as part of the Freetype-wrapper build process, which, it turns out, is actually hard-masked (i.e. -* flag) on Gentoo AMD64.

No idea why this isn't mentioned in the software requirements. Anyway, don't have time to deal with it this evening, so I guess I'll be generating the SVG manually... blah... that's going to slow me down quite a bit.