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Message: [QUOTE="anne001, post: 4517914"] I can run irb, then require "gtk2" in either terminal or xterm (X11) I got the same answer. Now I ran xhost localhost irb(main):001:0> require "gtk2" => true apparently your xhost suggestion was strong medicine, thank you unfortunately, I am seeing one of the errors which I thought had gone away: require "gtkglext" dyld: NSLinkModule() error dyld: Symbol not found: _pango_x_font_cache_unload Referenced from: /opt/local/lib/libgdkglext-x11-1.0.0.dylib Expected in: flat namespace something about pango. somebody else seems to have had a problem [URL]http://www.cozmixng.org/~w3ml/index.rb/rabbit-shockers/msg/191[/URL] don't know what it says. [/QUOTE]