Thank you for the review.

 
> Is it an unstable version? Latest release seems to be 16.3. If so, if
there is a strong reason to use it instead, we should give it in
a comment.

 
I tried to build 16.3 version but it fail. The cause is that skk-lookup.el needs an external file and that skk-xemacs.el needs be xemacs. There ware fixed at 17.0.50 version. 

After 17.x is released, I will apply all your suggestions and send patch again.

 
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Masaya Tojo