lib/ddr/derivatives/ptif_generator.rb in ddr-models-2.0.1 vs lib/ddr/derivatives/ptif_generator.rb in ddr-models-2.1.0.rc1

@@ -1,4 +1,6 @@
+require 'open3'
+
 module Ddr
   module Derivatives
     class PtifGenerator < Generator
 
       def self.output_mime_type