Sass installation on mac has been unsuccessful

  question, ruby

1. The 1.mac itself has ruby’s environment, so it does not need to be installed. At the same time, it detects version information:

$ gem -v
 $ ruby -v
 ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin16]

2. Use Taobao image:

$ gem sources -l

3. Install sass:

$ gem install sass
 ERROR:  While executing gem ... (Gem::DependencyError)
 Unable to resolve dependencies: sass requires sass-listen (~> 4.0.0)

I would like to ask why the installation was not successful. And how to install successfully, thank you

Taobao source has long been out of use, changeRuby ChinaOr direct official sources.