anchor.diff:  { lib, stdenv
  -, fetchpatch
   , fetchFromGitHub
   , autoreconfHook
   , pcre
  
positive.code: }:
  
  stdenv.mkDerivation rec {
    version = "4.0.5";
    pname = "yara";
  
    src = fetchFromGitHub {
      owner = "VirusTotal";
      repo = "yara";
      rev = "v${version}";
      sha256 = "1gkdll2ygdlqy1f27a5b84gw2bq75ss7acsx06yhiss90qwdaalq";
    };
  
    nativeBuildInputs = [ autoreconfHook pkg-config ];
  
negative.code:   ;
  
    preConfigure = "./bootstrap.sh";
  
    configureFlags = [
      (lib.withFeature withCrypto "crypto")
  