How to avoid flycheck report `reference to free variable ‘prelude-mode-map’` ?

[wd]

Maybe it's a dump question, but seems flycheck report all the prelude- symbols for this error, is there a way to avoid this error being reported?

[bbatsov]

That's on me - I never cared much about those warnings, so I didn't add the necessary code to suppress them. They are harmless, though.