>> https://github.com/rdp/ruby_simple_gui_creator/blob/master/README
>>
>> Cheers, and happy GUI editing.
>> -roger-
>>
> HI Roger!
> =A0the homepage link in your gemspec seems to be wrong
> =A0I used https instead of http and it works.

Oops looks like it was totally out of date and wrong..
https://github.com/rdp/ruby_simple_gui_creator is right.
Thanks for pointing it out.
-roger-