lib/nanoc3/base/item_rep.rb in nanoc3-3.1.7 vs lib/nanoc3/base/item_rep.rb in nanoc3-3.1.8

@@ -457,9 +457,10 @@
 
     def generate_diff
       if @old_content.nil? || self.raw_path.nil? || !@item.site.config[:enable_output_diff]
         @diff = nil
       else
+        require 'thread'
         @diff_thread = Thread.new do
           @diff = diff_strings(@old_content, @content[:last])
           sleep 2
           @diff_thread = nil
         end