One of the major vectors for fingerprinting in various ways is font rendering. It's extremely surprising how integrated with the OS font rendering is, considering it's something that can be done completely seamlessly in userspace for most applications.

I spent a long time integrating libpango/cairo (http://www.pango.org/ and https://www.cairographics.org/) into a semi-toy opengl game engine I wrote which had a Windows target, and was baffled at the level of complexity/interdependency required to build it. Gecko (firefox's rendering engine) maintains a fork of cairo https://github.com/mozilla/gecko/blob/0ea4c5812c2adecbed1d84... , which is as far as I can tell the only way to statically link it. Both these libraries require Glib.

There isn't an alternate minimalist open-source font rendering library as far as I'm aware, simply because the task of handling all font-rendering edge cases in all languages is so gargantuan. So we're stuck with a huge intertwined set of poorly understood C libraries, tightly integrated into the system and every application and ever-exploitable.