我使用rvm来安装ruby 1.9.3.即使它已成功安装,它也抱怨libyaml.现在,每当我想安装一个宝石(比如铁轨)时,这个警告会显示出来:
It seems your ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your ruby.
我使用的是Mac OS X 10.7(Lion).