Not sure why I\'m getting this, but I just installed RVM, the new Ruby 1.9, and reinstalled a bunch of gems, and I get this
/Users/johnsmith/.rvm/rubies/ruby-1.9.1-
To clarify, whatever path returns after it says insecure world writeable, is what you use.
So instead of: chmod go-w /opt/local/bin you would replace /opt/local/bin with whatever your path is.