README-install-v8-on-macos

Catalina
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   93  gem install bundler -v 1.17.3
   94  bundle install
   95  rbenv rehash
   96  bundle install
   97  ls -la
   98  cat .rbenv-gemsets
   99  gem uninstall libv8
  100  gem uninstall therubyracer
  101  brew rm v8
XXX  102  brew tap homebrew/dupes
XXX  103  brew tap homebrew/versions
  104  brew install v8-315
XXX  105  gem install libv8 -v 3.16.14.13 -- --with-system-v8
XXX  106  gem install therubyracer -- --with-v8-dir=/usr/local/opt/v8@3.15
  107  gem install libv8 -v 3.16.14.19 -- --with-system-v8
  108  gem install therubyracer -- --with-v8-dir=/usr/local/opt/v8@3.15
  109  history

Big Sur
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This is from https://gist.github.com/fernandoaleman/868b64cd60ab2d51ab24e7bf384da1ca#gistcomment-3494398
$ brew install v8@3.15
$ bundle config build.libv8 --with-system-v8
$ bundle config build.therubyracer --with-v8-dir=$(brew --prefix v8@3.15)
$ bundle install