Getting Firefox to build

Well, I've got a GTK2 library to build without any X source (and without any functionality, the ROLF backend consists of placeholders for the time being), and I want to get Firefox to build on top of that. It's not as easy as I'd like, the X library headers seem to get pulled in whether or not it's using X. It's been a decade since I had anything to do with COM, and there seems to be about 2000 COM interfaces in the tree. When I've had a look through them, hopefully I'll be able to identify which libraries need to be patched.