Package cl is deprecated

[pauljamesharper]

I get the following message when starting the latest Emacs built from Source on Debian 10.

Package cl is deprecated

I'm not sure where that is coming from. My Chinese is not very good but I think I need to put the following somewhere. https://emacs-china.org/t/package-cl-is-deprecated/10349

(require 'cl-lib)

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