摘要： Ruby 1.9.3-p0 makes psych—the replacement for 1.8.7’sYAMLlibrary, Syck—the defaultYAMLparser. Psych is a wrapper around libyaml, so you’re going to need it installed and configuredbeforeinstalling Ruby.If you install 1.9.3-p0 without libyaml, you’ll see warnings like this:It seems your ruby installa 阅读全文