Comment 6 for bug 1342227

On wheezy, you can install the ruby bits by first installing ruby18-full by hand, and then /not/ letting the install.sh script install ruby-full (which is actually ruby 1.9.1). If you're already tainted by ruby 1.9.1, you'll need to purge that, and then use update-alternatives to force use or ruby1.8 /and/ gem1.8 both. I had to go as far even as finding and `rm -rf`ing every directory that belonged to ruby 1.9.1.