Old program suddenly won't compile: PORTF not declared

Had a program for a project stored away...downloaded the new version of Arduino and now it won't compile.

"PORTF not declared in this scope"

I must be missing something simple...missing a library?

When you encounter an error you'll see a button on the right side of the orange bar "Copy error messages". Click that button. Paste the error in a message here USING CODE TAGS (</> button on the toolbar).

Do you maybe have the wrong board selected in the Tools > Board menu, or are you using a different board than you were before?

Did you select the correct Arduino, one which has a PORTF?

Bingo. Wrong board was selected. Thank you for the dummy check.