Just to add, http://github.com/pharo-project/pharo-vm now builds completely autonomous under travis: https://travis-ci.org/pharo-project/pharo-vm
that means, this is currently the only build that takes a complete setup into account. Even our current jenkins job rely on a properly setup slave, with travis you have to specify exactly which packages you want.
Camillo which packages are you talking about? Linux one the slave environment? I love to read https://travis-ci.org/pharo-project/pharo-vm
BTW I could not see GStreamer plugin and I know that annick needs it and we will be looking at it with JB
Stef