Error during verify/compile of marlin 1.1.9

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Hi all,

I am looking to compile a firmware and encountered this error : DIO31_RPORT was not declared in this scope.

Can anyone help?

Just my 2 cents:
A similar error message can be found in https://www.reddit.com/r/CR10/comments/dwp15p/dio44_rport_was_not_declared_in_this_scope/f7n77qr/
The solution there was: "The problem was that I didn't have the Programmer set to Arduino as ISP as you suggest."