tried it. its great. 2 steps in first post are a bit wrong. first of all file name is edge_detect not edge (archive name replaced as when erlos34 uploaded it, its name was edge).

correct unpacking command is tar xvzf edge_detect.tar.gz

and one more thing. edge_detect file doesn't extract in its own folder. so cd edge command is no longer needed until anyone repacks the archive to add a folder. only ./edge_detect is needed.

expert/users that know about N900 much knows how to extract it but this may be a problem for noob users.

Thanks everyone for your hardwork. its really cool.