anchor.diff: -{ stdenv, fetchurl, fetchpatch,  dejagnu, doCheck ? false
  +{ stdenv, fetchurl, fetchpatch
   , buildPlatform, hostPlatform, autoreconfHook
  +, doCheck ? true, dejagnu
   }:
   
   stdenv.mkDerivation rec {
  
positive.code:     # The tests use -O0 which is not compatible with -D_FORTIFY_SOURCE.
      NIX_HARDENING_ENABLE=''${NIX_HARDENING_ENABLE/fortify/}
    '';
  
    inherit doCheck;
  
  
negative.code: 
    outputs = [ "out" "dev" "man" "info" ];
  
    nativeBuildInputs = stdenv.lib.optional hostPlatform.isRiscV autoreconfHook;
  
    configureFlags = [
  