Core libraries like glibc and Xlib are pretty well defined. You need to ship your own copy of the widget library of choice, but that isn't a big deal. You coul

Core libraries like glibc and Xlib are pretty well defined. You need to ship your own copy of the widget library of choice, but that isn't a big deal. You could even ship an Xlib copy and rely on the fact that there is an X server speaking the same protocol. It's all perhaps a bit messy, but it works.