setup.rb in rmagick-2.13.1 vs setup.rb in rmagick-2.13.2

@@ -782,10 +782,10 @@
       load File.expand_path(arg.split(/=/, 2)[1])
       $".push 'rbconfig.rb'
     else
       require 'rbconfig'
     end
-    ::Config::CONFIG
+    defined?(RbConfig) ? ::RbConfig::CONFIG : ::Config::CONFIG
   end
 
   def initialize(ardir_root, config)
     @ardir = File.expand_path(ardir_root)
     @config = config