How can I install xrefresh monitor on my mac?

I type in command line
sudo gem install xrefresh
and
sudo gem install xrefresh-monitor
and
sudo gem install xrefresh_monitor

Rubygems report:
"could not find gem xrefresh locally or in a repository"

Need I specify some unusual repository to get it?
 
sad I’m confused
Inappropriate?
2 people have this question

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