Using a C-program from Java via JNI

I want to use an open source finite state tool ([login to view URL]) that is written in C from a Java program. The tool builds a finite state transducer that is afterwards used many times. While the transducer can be built from a script, I need a JNI interface that is able to load it, use it via an "apply up" command, and collect the output in an ArrayList. I work on OS X, so it would be good if you were using OS X or a Linux variant.