Charlock Holmes is a pain in the ass to install (well at least for me anyway).
After lots of Googling I finally came up with the best way to consistently get Charlock Holmes installing as part of my normal bundle install. This fix has also worked for other teammates as well.
One part of it was upgrading my version from
0.7.6 and the other was running these few commands:
$ gem uninstall charlock_holmes $ brew install icu4c $ gem install charlock_holmes -- --with-icu-dir=/usr/local/Cellar/icu4c
This helped to fix this error message:
An error occurred while installing charlock_holmes (0.7.6), and Bundler cannot continue. Make sure that `gem install charlock_holmes -v '0.7.6' --source 'https://rubygems.org/'` succeeds before bundling.