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I just tried to install my first gem on a clean OS Lion install and got:
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions into the /Library/Ruby/Gems/1.8 directory.
I know I could just use sudo but I’d like to know whether it’s possible to install gems as non-root.
You can use RVM to generate a place to install ruby versions in user space.
https://rvm.io