setup.rb in swishe-0.4.2 vs setup.rb in swishe-0.4.3

@@ -254,12 +254,17 @@
     lookup(key).set val
   end
 
 end
 
-c = ::Config::CONFIG
 
+c = if defined?(RbConfig) then
+      RbConfig::CONFIG
+    else
+      ::Config::CONFIG
+    end
+
 rubypath = c['bindir'] + '/' + c['ruby_install_name']
 
 major = c['MAJOR'].to_i
 minor = c['MINOR'].to_i
 teeny = c['TEENY'].to_i
@@ -352,10 +357,9 @@
 class ConfigTable_class   # open again
   ALIASES = {
     'std-ruby'         => 'stdruby',
     'site-ruby-common' => 'siteruby',     # For backward compatibility
     'site-ruby'        => 'siterubyver',  # For backward compatibility
-    'bin-dir'          => 'bindir',
     'bin-dir'          => 'bindir',
     'rb-dir'           => 'rbdir',
     'so-dir'           => 'sodir',
     'data-dir'         => 'datadir',
     'ruby-path'        => 'rubypath',