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This page describes how to install sup 0.13.x on Fedora 18. It might work on other versions of Fedora, too.
You might want to prepend commands with sudo where root access is needed.
yum install gcc gcc-c++ ncurses-devel libuuid-devel libuuid zlib-devel
yum install ruby-devel rubygem-rake
Or:
gem install sup
See New User Guide.