# File lib/childprocess.rb, line 114
    def arch
      @arch ||= (
        host_cpu = RbConfig::CONFIG['host_cpu'].downcase
        case host_cpu
        when /i[3456]86/
          if workaround_older_macosx_misreported_cpu?
            # Workaround case: older 64-bit Darwin Rubies misreported as i686

            "x86_64"
          else
            "i386"
          end
        when /amd64|x86_64/
          "x86_64"
        when /ppc|powerpc/
          "powerpc"
        else
          host_cpu
        end
      )
    end