mike@mike-laptop:~$ screenruler
Loading libraries...
/usr/lib/ruby/vendor_ruby/1.8/x86_64-linux/pango.so: /usr/lib/ruby/vendor_ruby/1.8/x86_64-linux/pango.so: undefined symbol: rb_cCairo_Context - /usr/lib/ruby/vendor_ruby/1.8/x86_64-linux/pango.so (LoadError)
	from ./utils/addons_ruby.rb:59:in `require'
	from ./utils/addons_ruby.rb:59:in `each'
	from ./utils/addons_ruby.rb:59:in `require'
	from /usr/lib/ruby/vendor_ruby/1.8/pango.rb:28
	from ./utils/addons_ruby.rb:59:in `orig_require'
	from ./utils/addons_ruby.rb:59:in `require'
	from ./utils/addons_ruby.rb:59:in `each'
	from ./utils/addons_ruby.rb:59:in `require'
	from /usr/lib/ruby/vendor_ruby/gtk2/base.rb:14
	from ./utils/addons_ruby.rb:59:in `orig_require'
	from ./utils/addons_ruby.rb:59:in `require'
	from ./utils/addons_ruby.rb:59:in `each'
	from ./utils/addons_ruby.rb:59:in `require'
	from /usr/lib/ruby/vendor_ruby/1.8/gtk2.rb:11
	from ./utils/addons_ruby.rb:59:in `orig_require'
	from ./utils/addons_ruby.rb:59:in `require'
	from ./utils/addons_ruby.rb:59:in `each'
	from ./utils/addons_ruby.rb:59:in `require'
	from /usr/bin/screenruler:51