Customizable modes and package.el

[Sebastian Wiesner]

Hello,

I have a globalized minor mode defined as follows:

(define-globalized-minor-mode global-flycheck-mode flycheck-mode
  flycheck-mode-on-safe
  :init-value nil
  :group 'flycheck
  :require 'flycheck)

If my understanding is correct, users should now be able to enable
"global-flycheck-mode" through the customize interface, shouldn't
they?  After all, I can see the mode in customize, enable it, and
Emacs writes the following form to my init file:

(custom-set-variables
...
 '(global-flycheck-mode t nil (flycheck))
 ...

Now, my users usually install my package via ELPA, and by default,
ELPA packages do not become available until *after* the init file was
loaded.

Consequently, the above form fails to load, since customize tries to
load a library which isn't available yet. I read the documentation on
customize again, but I didn't find anything related to package.el at
all.

What did I do wrong?

Greetings,
Sebastian