Make sure that `gem install libv8 -v '3.16.14.19' --source 'https://rubygems.org/'` succeeds before bundling.

This happened on Mac OS 10.10.5. I needed a specific version of libv8, so I used the -v flag in gem install.

Resolution

gem install libv8 -v 3.16.14.19 -- --with-system-v8

bundle config build.libv8 --with-system-v8