it seems the usual way to use Ruby / Tk on Win XP is to install
ActiveState’s ActiveTcl?
it is quite a huge installation.
is the other way is to download the Tk source code and compile it
yourself using Visual Studio or cygwin?
I don’t think there is a practical alternative unfortunately. It is
quite large, but well worth it. I have tried several of the available
GUI toolkits for Ruby, and I always return to Tk. Well worth the large
install.