Centos 6:
yum -y install avr-gcc.x86_64
http://arduino.cc/download.php?f=/arduino-1.0.6-linux64.tgz
http://dangerousprototypes.com/forum/viewtopic.php?f=34&t=6761
http://www.protostack.com/accessories/usbasp-avr-programmer
http://www.fischl.de/