It seems that stdlib.h is not included. Both error and abort need that. Cheers > -I then ran "C:\ode-0.035>make ode-lib" > And I got this: > http://www.farseer.com/images/screenshots/ode/Makeodelib.jpg > > This is where I'm at. I'm going to try to dig in and find the problems, but > wanted to get this posted in case someone can give me some more guidance.