# File lib/phusion_passenger/platform_info/compiler.rb, line 489
        def self.electric_fence_ldflags
                if os_name == "macosx"
                        ['/opt/local', '/usr/local', '/usr'].each do |prefix|
                                filename = "#{prefix}/lib/libefence.a"
                                if File.exist?(filename)
                                        return filename
                                end
                        end
                        return nil
                else
                        return "-lefence"
                end
        end