If there is no other answer, I will write it now.
I just wrote access to Readline with a gem in my application directly:
gem 'rb-readline', '~> 0.4.2'
The reason I specifically chose 0.4.2 is because, from August 14, 2013, there is an existing error with later versions.
Somehow, when I updated the OS, the call to my Brew Readline installation was no longer relevant. I do not know why. I suppose there is a way to align paths again so that it can potentially work globally in all my applications, but at the moment I have only one sensitive to international relations.
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