compiler warning "the function X might not be defined at runtime"

[Samuel Wales]

What more needs to be done to get rid of that warning?

Thanks.

;;(unless (functionp 'scroll-lock-mode) (defun ...
(require 'scroll-lock)
(eval-when-compile (require 'scroll-lock))
(eval-when (eval load compile) (require 'scroll-lock))
(defun alpha-1 ()
  "even more of a kludge to restore sanity after simultaneous scrolling."
  (interactive)
  (one-window)
  (require 'scroll-lock)
  (scroll-lock-mode 0))

-- 
Myalgic encephalomyelitis denialism is causing death (decades early;
Jason et al. 2006) and severe suffering, pain, and disability (worse
than most other serious diseases studied; Schweitzer et al. 1995) and
grossly corrupting science.
http://www.meactionuk.org.uk/What_Is_ME_What_Is_CFS.htm