I have just installed fxruby on my system and seeing the following
irb(main):001:0> require ‘fox16’
irb(main):002:0> include Fox
irb(main):003:0> app = FXApp.new
Expected Xft library version 20113 or greater; was 20112.
Everything seems to be working fine otherwise. I am using puppy linux
412, fox-toolkit 1.6.34, and fxruby 1.6.18.