# File src/ruby_supportlib/phusion_passenger/platform_info/compiler.rb, line 534
    def self.electric_fence_ldflags
      if os_name_simple == "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