-(declare-function rmail-show-message "rmail" (&optional n no-summary))
-(declare-function rmail-what-message "rmail" ())
-(defvar rmail-current-message)
+(declare-function rmail-show-message "rmail" (&optional n no-summary))
+(declare-function rmail-what-message "rmail" (&optional pos))
+(declare-function rmail-toggle-header "rmail" (&optional arg))
+(declare-function rmail-widen "rmail" ())
+(defvar rmail-current-message) ; From rmail.el
+(defvar rmail-header-style) ; From rmail.el