anchor.diff:    '';
   
     NIX_CFLAGS_COMPILE = "-I.";
  -  
  +
  +  buildFlags = "memtest.bin";
  +
     installPhase = ''
       mkdir -p $out
       cp memtest.bin $out/
  
positive.code: 
    meta = {
      homepage = http://www.memtest.org/;
      description = "A tool to detect memory errors, fork from memtest86";
    };
  }
  
negative.code: { stdenv, fetchurl }:
  
  stdenv.mkDerivation rec {
    name = "memtest86+-5.01";
  
    src = fetchurl {
      url = "http://www.memtest.org/download/5.01/${name}.tar.gz";
      sha256 = "0fch1l55753y6jkk0hj8f6vw4h1kinkn9ysp22dq5g9zjnvjf88l";
    };
  
    preBuild = ''
  