Very nice, and I liked the detailed description of implementation choices. A bunch of which I personally wouldn't agree with (of course) but that's programming for you. :)

As a minor detail, even as a long time computer user of the technical kind, I found it difficult to distinguish between "pkgconfig" and "pkg-config" as being two separate things throughout the text, probably since the dash is silent when I pronounce these words. Not sure how to fix it, perhaps by actually making the names longer ("the Freedesktop pkgconfig" and "pkgconfig.org" for instance).