The Solution
brew tap InstantClientTap/instantclient
brew install instantclient-basic
brew install instantclient-sqlplus
brew install instantclient-sdk
Sourced from: https://stackoverflow.com/a/65320336
The Error
➜ bundle install
Error Message:
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers."oci.h" could not be found in: /usr/local/lib/sdk/include
An error occurred while installing ruby-oci8 (2.2.12), and Bundler cannot continue.
turnspike 