I'm working on making a copy of Repsnapper that inputs another filetype of 3d models, but I've hit a wall of sorts. I've got everything changed in the code, correctly as far as I can tell, but I can't get it to finish compiling. I run ./autogen.sh, and that runs fine, but when I run make, it tells me that it has a bunch of undefined references, which I assume means it can't find the libraries for the new filetype. How can I make it see and use those? I'm running Ubuntu 14.04, if that makes a difference.