sjis.rb in prawn-0.11.1

- old
+ new

@@ -8,10 +8,11 @@
 # 
 # NOTE: only works on ruby1.9 compatible VMs, and requires the current
 #       font to include japanese glyphs. On 1.8.x comaptible VMs, an exception
 #       will be raised.
 
-require "#{File.dirname(__FILE__)}/../example_helper.rb"
+require File.expand_path(File.join(File.dirname(__FILE__),
+                                   %w[.. example_helper]))
 
 begin
   ruby_19 do  
     datafile = File.join(File.dirname(__FILE__), "..", "..", "data", 
       "shift_jis_text.txt")