Psych YAML in ruby 1.9.2 with RVM and Snow Leopard OSX
Note that you must have libyaml installed before you compile ruby, so this probably means you’ll need to recompile your current version.
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sudo brew install libyaml rvm install ruby-1.9.2 --with-libyaml-dir=/usr/local ruby -rpsych -e 'puts Psych.load("win: true")' |