Sass: Listen has fallen back to polling

I am trying to use sass, and it gives me an error when I compile my files. It works (the .scss files are compiled into .css files) but then I get this warning: `WARNING: Listen has fallen back to polling, learn more at https://github.com/guard/listen#fallback.` Of course I read the link given, but except rebooting the os, I don't know what the other solutions are. If needed here are some informations about the versions: ruby: 1.9.3 sass: 3.1.19 everything on a mac. Can somebody help me? Thanks (oh, and I still have this problem => Ruby not starting on mac os x ) EDIT I found the solution ... listen was not installed (yes I am ashamed). So you can ignore my question, but if you have an idea the old one about ruby I am listening (no pun intended)