Maybe like me you want to mutualize the usage of your Raspberry Pi for media center and domotic server. I based my installation on a Xbian distribution. It's quite simple but you need to install Curl if you want to achieve the installation and LibArchive12 if you want your z-wave server to start :
Install Curl (mandatory to register to RaZberry project news)
# sudo apt-get install curl
Install missing libraries :
# sudo apt-get install libarchive12
Install Z-wave (standard installation)
# wget -q -O - http://razberry.z-wave.me/install | sudo bash
Note : I just wanted to share that to find it easily.