Using OpenGL Toon Shader in GLSL

I'm interested in learning how to write toon shaders in OpenGL Shading Language. I found a demo, but haven't been able to get the demo running on my computer. The trouble I'm having is with writing an application which will use this shader. Could somebody please show me how to write a simple application which would use this shader? I'm using GLSL 1.2 (OpenGL 2.1) on Linux.