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From: Glenn Morris <rgm@gnu.org>
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Subject: Re: emacs-25 10597c9: Don't use 'find-program'
Date: Mon, 18 Apr 2016 12:16:15 -0400
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PS grep.el may use -exec, or it may use -print and xargs. So you will
have to extend its logic to allow switching between your different
versions of find according to which branch it takes. And presumably
encourage other authors using find similarly to do the same.

"Is your journey really necessary?"