• https://jekyllrb.com/docs/ruby-101/#gems

• https://jekyllrb.com/docs/installation/

• https://www.ruby-lang.org/en/downloads/

• https://rubyinstaller.org

• https://rubyinstaller.org/2019/09/10/rubyinstaller-2.6.4-1-2.5.6-1-and-2.4.7-1-released.html

• https://rubyinstaller.org/downloads/

• https://rubygems.org/pages/download

• gem update --system

• ridk install

• https://www.gnu.org/software/make/

• http://www.msys2.org/

• https://blog.csdn.net/mouday/article/details/79300135