Toolkit: A Front-End Framework for the Modern Web

Although I don’t have any plans to use this framework in my project at the moment because I have to learn and use Bootstrap for it, I felt this is concise, simple and well-designed when I checked the official web site. So I forked toolkit at github. I want to try it on ruby on rails.
One question: are there any compatibility problems with other frameworks, such as compass or susy?
thanks.