anchor.diff:          --replace "ARFLAGS = -static -o" "ARFLAGS = -cru"
     '';
   
  -  nativeBuildInputs = optionals stdenv.hostPlatform.isx86 [ nasm which ];
  -
  -  preBuild = optionalString stdenv.hostPlatform.isx86 "${stdenv.shell} rdrand-nasm.sh";
     makeFlags = [ "PREFIX=${placeholder "out"}" ];
     buildFlags = [ "shared" "libcryptopp.pc" ];
     enableParallelBuilding = true;
  
positive.code: { lib, stdenv, fetchFromGitHub, nasm, which }:
  
  with lib;
  stdenv.mkDerivation rec {
    pname = "crypto++";
    version = "8.2.0";
    underscoredVersion = strings.replaceStrings ["."] ["_"] version;
  
    src = fetchFromGitHub {
      owner = "weidai11";
      repo = "cryptopp";
      rev = "CRYPTOPP_${underscoredVersion}";
      sha256 = "01zrrzjn14yhkb9fzzl57vmh7ig9a6n6fka45f8za0gf7jpcq3mj";
    };
  
    postPatch = ''
  
negative.code:   preInstall = "rm libcryptopp.a"; # built for checks but we don't install static lib into the nix store
    installTargets = [ "install-lib" ];
    installFlags = [ "LDCONF=true" ];
    postInstall = lib.optionalString (!stdenv.hostPlatform.isDarwin) ''
      ln -sr $out/lib/libcryptopp.so.${version} $out/lib/libcryptopp.so.${lib.versions.majorMinor version}
      ln -sr $out/lib/libcryptopp.so.${version} $out/lib/libcryptopp.so.${lib.versions.major version}
    '';
  
    meta = {
      description = "Crypto++, a free C++ class library of cryptographic schemes";
      homepage = "https://cryptopp.com/";
      changelog = "https://raw.githubusercontent.com/weidai11/cryptopp/CRYPTOPP_${underscoredVersion}/History.txt";
      license = with lib.licenses; [ boost publicDomain ];
      platforms = lib.platforms.all;
      maintainers = with lib.maintainers; [ c0bw3b ];
    };
  }
  