bmink

OS X does not come with readline, rather, it comes with libedit which is touted as being a readline-compatible replacement.
This may be true for basic usage, but advanced usage will run into compabitily problems.

For example, trying to build https://github.com/ulfalizer/readline-and-ncurses on Mac will complain about not finding some variables exported by readline.

Solution: brew install readline

Brew will not override OS X's readline (which is really libedit). Its output helpfully states:

--------------------

bmink

hello, world