anchor.diff:  
     nativeBuildInputs = [
       cmake
  -    clang
  +
  +    # The default clang_7 will result in reproducible ICE.
  +    clang_8
  +
       pkg-config
       qmake
       qttools
  +    curl
     ];
   
     meta = with lib; {
  
positive.code: , abseil-cpp
  , libGL
  , zlib
  }:
  
  mkDerivation rec {
    pname = "qv2ray";
    version = "2.6.3";
  
    src = fetchFromGitHub {
      owner = "Qv2ray";
      repo = "Qv2ray";
      rev = "v${version}";
      sha256 = "sha256-zf3IlpRbZGDZMEny0jp7S+kWtcE1Z10U9GzKC0W0mZI=";
      fetchSubmodules = true;
    };
  
    cmakeFlags = [
      "-DCMAKE_BUILD_TYPE=Release"
  
negative.code: { lib
  , stdenv
  , mkDerivation
  , fetchFromGitHub
  , qmake
  , qttools
  , cmake
  , clang_8
  , grpc
  , protobuf
  , openssl
  