cache_store and page_cache_directory are already defined in caching

and pages

actionpack/lib/action_controller/metal/compatibility.rb

@@ -46,11 +46,8 @@ class << self
       cattr_accessor :use_accept_header
       self.use_accept_header = true
 
-      cattr_accessor :page_cache_directory
       self.page_cache_directory = defined?(Rails.public_path) ? Rails.public_path : ""
 
-      cattr_reader :cache_store
-
       cattr_accessor :consider_all_requests_local
       self.consider_all_requests_local = true
 
@@ -116,7 +113,7 @@ def _find_layout(name, details)
       details[:prefix] = nil if name =~ /\blayouts/
       super
     end
-    
+
     # Move this into a "don't run in production" module
     def _default_layout(details, require_layout = false)
       super