This version has been bcopified, so to install it (on an ubuntu system) perform the following:

$ sudo apt-get install compiz-dev compiz-bcop
$ make install

It does not need to be built or installed as root. It will install in the local user space by default. This is just a forward-port to compiz 0.8.4, and a cleanup. Download it. To know more about keynav, check out the original keynav post.