CBS already decided to install the demos with ggi- prefix in Debian. I keep this up, you just have to type ggi-<TAB> and see all demos and other binaries to choose from.
I didn't install cpuinfo yet, when you don't either it's ok. The existence of this functionality is recorded in debian.changelog. I might also add it to the readme. The sources are installed to /usr/share/doc/libggi0/examples anyway. martin
