zipfilesystem.rb is becoming big and not everyone will want to use that code. Therefore zip.rb no longer requires it. Instead you must require zipfilesystem.rb itself if you want to use it

zip.rb

@@ -5,7 +5,6 @@ require 'singleton'
 require 'tempfile'
 require 'ftools'
 require 'zlib'
-require 'zipfilesystem'
 
 unless Enumerable.instance_methods(true).include?("inject")
   module Enumerable  #:nodoc:all
@@ -977,7 +976,6 @@ module Zip
   class ZipEntryNameError              < ZipError; end
 
   class ZipFile < ZipCentralDirectory
-    include ZipFileSystem
 
     CREATE = 1
 

zipfilesystem.rb

@@ -1,5 +1,6 @@
 #!/usr/bin/env ruby
 
+require 'zip'
 require 'filearchive'
 
 module Zip
@@ -154,4 +155,9 @@ module Zip
 
     end
   end
+
+  class ZipFile
+    include ZipFileSystem
+  end
 end
+

zipfilesystemtest.rb

@@ -2,7 +2,7 @@
 
 $VERBOSE = true
 
-require 'zip'
+require 'zipfilesystem'
 require 'rubyunit'
 
 include Zip