➜ sample_app git:(master) ✗ gem install bootstrap-sass
Fetching: autoprefixer-rails-8.6.5.gem (100%)
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /Library/Ruby/Gems/2.3.0 directory.
为什么用 gem 安装都要加上sudo
权限呢~