Lich Install Problem on my Mac

[CrystalTears]

$ gem install gtk2
Fetching: gtk2-3.1.8.gem (100%)
Building native extensions. This could take a while...
Successfully installed gtk2-3.1.8
Parsing documentation for gtk2-3.1.8
Installing ri documentation for gtk2-3.1.8
Done installing documentation for gtk2 after 4 seconds
1 gem installed

YAY!

Then <sigh>

I got this again:

$ sudo ruby lich/lich.rbw --gemstone --avalon
/Users/me/.rbenv/versions/2.2.5/lib/ruby/gems/2.2.0/gems/gtk2-3.1.8/lib/gtk2.rb:13:in `init': Cannot open display: /private/tmp/com.apple.launchd.xyWHslCf9L/org.macosforge.xquartz:0 (Gtk::InitError)
from /Users/me/.rbenv/versions/2.2.5/lib/ruby/gems/2.2.0/gems/gtk2-3.1.8/lib/gtk2.rb:13:in `<top (required)>'
from /Users/me/.rbenv/versions/2.2.5/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:133:in `require'
from /Users/me/.rbenv/versions/2.2.5/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:133:in `rescue in require'
from /Users/me/.rbenv/versions/2.2.5/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:40:in `require'
from lich/lich.rbw:545:in `<main>'

I'm just going to sit in the corner and rock myself in misery.