In Emacs, what does this error mean? "Warning: cl package required at runtime"

emacs lisp common-lisp
Cheeso picture Cheeso · Feb 16, 2011 · Viewed 10.5k times · Source

I am byte-compiling a module. It gives me this warning:

 Warning: cl package required at runtime

Why is this a warning? I am well aware that I am using the cl package. In fact there is a (require 'cl) statement in the module.

Is there something wrong with using the cl stuff?

If so, is there a list of published workarounds? The main things I use are mapcan and delete-duplicates.

Answer

Oleg Pavliv picture Oleg Pavliv · Feb 16, 2011

The reason of this warning is a GNU policy which does not want a package cl to be used in Elisp. But it would be foolish as well to prohibit it completely. So they decided to show a warning.

You can find more information here

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