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