Rails - Feb 2010 - How to set RUBY EXECUTABLE path in Ruby Gems Environment

I have ruby 2 version in my Mac which are 1.8.6 and 1.8.7.
I would like to set Rubygems environment to point to Ruby 1.8.7.

Anyone know this issure????

ubyGems Environment:
  - RUBYGEMS VERSION: 1.3.5
  - RUBY VERSION: 1.8.6 (2008-08-11 patchlevel 287) [universal-
darwin9.0]
  - INSTALLATION DIRECTORY: /Library/Ruby/Gems/1.8
  - RUBY EXECUTABLE: /System/Library/Frameworks/Ruby.framework/
Versions/1.8/usr/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - universal-darwin-9
  - GEM PATHS:
     - /Library/Ruby/Gems/1.8
     - /Users/panu/.gem/ruby/1.8
     - /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - :sources => ["http://gems.rubyforge.org/", "http://
gems.github.com/"]
  - REMOTE SOURCES:
     - http://gems.rubyforge.org/
     - http://gems.github.com/

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