# File lib/gettext/tools/msgmerge.rb, line 305
        def initialize
          @definition_po = nil
          @reference_po = nil
          @update = false
          @output = nil
          @order = :reference
          @po_format_options = {
            :max_line_width => POEntry::Formatter::DEFAULT_MAX_LINE_WIDTH,
          }
          @enable_fuzzy_matching = true
          @update = nil
          @output_obsolete_entries = true
          @backup = ENV["VERSION_CONTROL"]
          @suffix = ENV["SIMPLE_BACKUP_SUFFIX"] || "~"
          @input_dirs = ["."]
        end