You can always edit which one is rubyused by editing the build command settings:
subl ~/Library/Application\ Support/Sublime\ Text\ 2/Packages/Ruby/Ruby.sublime-build
Change the default value to "ruby"any path you need. The version you are using at any given time can be detected with:
which ruby
Alternatively, you can simply refer to the default value, which is often found in /opt/local/rvm/bin/ruby.
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