# File src/ruby_supportlib/phusion_passenger/platform_info/compiler.rb, line 516
    def self.dmalloc_ldflags
      if !ENV['DMALLOC_LIBS'].to_s.empty?
        return ENV['DMALLOC_LIBS']
      end
      if os_name_simple == "macosx"
        ['/opt/local', '/usr/local', '/usr'].each do |prefix|
          filename = "#{prefix}/lib/libdmallocthcxx.a"
          if File.exist?(filename)
            return filename
          end
        end
        return nil
      else
        return "-ldmallocthcxx"
      end
    end