Ruby 1.8.7 does not have a singleton class, so removing it.

lib/brakeman/report/renderer.rb

@@ -2,13 +2,15 @@ class Brakeman::Report
   class Renderer
     def initialize(template_file, hash = {})
       hash[:locals] ||= {}
-      hash[:locals].each do |key, value|
-        singleton_class.send(:define_method, key) { value }
-      end
+      singleton = class << self; self end
 
-      singleton_class.send(:define_method, 'template_file') { template_file }
+      hash[:locals].each do |attribute_name, attribute_value|
+        singleton.send(:define_method, attribute_name) { attribute_value }
+      end
 
-      singleton_class.send(:define_method, 'template') {
+      # There are last, so as to make overwriting these using locals impossible.
+      singleton.send(:define_method, 'template_file') { template_file }
+      singleton.send(:define_method, 'template') {
         File.read(File.expand_path("templates/#{template_file}.html.erb", File.dirname(__FILE__)))
       }
     end