Re this question: Lexical Tie-Ins with Flex and Bison there are two things called "flex". Is there another tag for one or the other which could be used instead?
I'm not sure how to go about editing tags, or I would have already, but this was a poor choice of tag. Flex is not a gnu program -- never was and never will be. It's distributed under a BSD-style license, not the GPL. Nothing should be done to foster the utterly false notion that Flex is associated with GNU in any way.