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When I check for the gtk version that I am using (#gtk-config --version) I get "1.2.10". How can I switch to gtk2.0?
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You don't need to worry about that. Arch has a package for gtk 1 (gtk) and one for gtk 2 (gtk2). All gtk apps except a few ones like xmms use gtk2. So it's probably already installed on your system.
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