Errors During Prerequisites Check

To re-issue the checks, use make prereq.

• GNU make 3.80 too old
  On a Fedora Core 4 hostsystem the first you'll get is

  [label=error message with too old GNU make]
     $ make
     GNU make 3.80 too old.
     Please install GNU make 3.81 or higher to continue.
     You can override this check, see http://www.freewrt.de for details.
     It is suggested to upgrade your copy of bison to
     GNU Bison 2.3 because of its bug fixes.
     make: *** [.prereq_done] Error 1
  

  it is quite a nice error that tells you to use more up to date software, but we can anyhow give this hostsystem a try and tell make to ignore those errors/warnings running make prereq-noerror.