Installation: Archlinux - 5long/sup GitHub Wiki
This page describes how to install sup 0.13.x on an up-to-date Archlinux system.
Install System packages
Install the base-devel group by running:
pacman -S base-devel
Install Ruby, Rubygems and Rake
Unfortunately sup doesn't run on Ruby 2.0 which is in Archlinux's official repository. You'll have to install a lower version Ruby via rvm or rbenv.
For now it is recommended to use Ruby 1.9.3 to run sup. But development to make sup run on Ruby 2.0 is on the way.
Install sup via rubygems
This should be easy:
gem i sup
Next step
See New User Guide.