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if [[ -s "/Library/Frameworks/MacRuby.framework/Versions/0.5" ]]  ; then
    alias macruby05="/Library/Frameworks/MacRuby.framework/Versions/0.5/usr/bin/macruby"
fi
if [[ -s "/Library/Frameworks/MacRuby.framework/Versions/0.6" ]]  ; then
    alias macruby06="/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/bin/macruby"
fi
if [[ -s "/Library/Frameworks/MacRuby.framework/Versions/0.7" ]]  ; then
    alias macruby07="/Library/Frameworks/MacRuby.framework/Versions/0.7/usr/bin/macruby"
fi
if [[ -s "/Library/Frameworks/MacRuby.framework/Versions/0.8" ]]  ; then
    alias macruby08="/Library/Frameworks/MacRuby.framework/Versions/0.8/usr/bin/macruby"
fi