Switch from GNU readline to editline(?)
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bshepherdson commented
GNU readline is GPL licensed, so things containing it need to be open source themselves. I'm not a lawyer, but I think the Apache-licensed FCC is okay for now. But shipping a closed-source binary built using FCC that linked against GNU readline would not be okay.
editline and its dependency ncurses have less strong licenses (BSDish and X11/MIT respectively) which are compatible with shipping a closed-source binary that links against them.