anchor.diff:  { stdenv, buildPackages
  -, fetchurl, readline70 ? null, texinfo ? null, binutils ? null, bison
  +, fetchurl, readline70 ? null, texinfo ? null, binutils ? null, bison, autoconf
   , buildPlatform, hostPlatform
   , interactive ? false
   }:
  
positive.code:     ''
      # most space is taken by locale data
      else ''
        rm -r "$out/share" "$out/bin/bashbug"
      '';
  
    meta = with stdenv.lib; {
  
negative.code: 
    postInstall = ''
      ln -s bash "$out/bin/sh"
      rm -f $out/lib/bash/Makefile.inc
    '';
  
    postFixup = if interactive
  