How to install therubyracer gem on 10.10 Yosemite?

by 
gem uninstall libv8
brew install v8
gem install therubyracer
gem install libv8 -v '3.16.14.3' -- --with-system-v8

this is the only way it worked for me on 10.10 (ruby 2.1.2)

Or try gem install libv8 -v 'XX.XX.XX' -- --with-system-v8 adding the version of the gem 🙂

UPDATE for Mac OS Catalina:

brew tap homebrew/versions
brew install [email protected]
brew link --force [email protected]
gem install libv8 -v 'XX.XX.XX' -- --with-system-v8
gem install therubyracer

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