Could not find a valid gem 'compass' (>= 0) in any repository compass安装失败解决方案

安装完成ruby gem 之后，通过 gem install compass 安装compass~~ 出现如下报错  Could not find a valid gem ‘compass‘ (>= 0) in any repository    然后尝试在 https://rubygems.org/ 下载 compass-1.0.3.gem 本地安装 又提示了 rb-inotify 安装失败~~

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