Daredevil SKK (DDSKK) is an Emacs Lisp version of SKK.
If you use DDSKK 14.2 or later on Emacs 22 or later, then you no longer need to install APEL.
Please install DDSKK 15.1 or later when using the DDSKK in GNU Emacs 24.3.
You may want to obtain one or more of SKK dictionaries.
Please refer to the page on SKK documents.