install pure data on raspberry pi
Pi Guide
download and installmost recent raspberrian package
this script uses 0.43.4, but the most recent at any given time is on sourceforge
wget http://cl.ly/SqbC/pd-extended_0.43.4~extended1-1~raspbian_wheezy_armhf.deb
sudo dpkg -i pd-extended_0.43.4~extended1-1~raspbian_wheezy_armhf.deb
sudo apt-get -f install
then launch pd with pd-extended