ruby <2.4 used to ship with the tk extension, which was built as the -tk subpackage. Starting in ruby 2.4, they moved the code to a gem, and they have released occassional improvements since (an earlier version segfaulted at exit).
After using both ruby-qt3 (x11/kde/bindings3) and ruby-qt4 (x11/kde4/ruby-qt) in the past, I eventually converted my ruby GUI programs to ruby-tk as the ruby-tk API is simpler and more idiomatic. Tested on amd64. Can another developer please review and provide an ok to import? Thanks, Jeremy
ruby-tk.tar.gz
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