anchor.diff:  
   buildPythonPackage rec {
     pname = "httpcore";
  -  version = "0.14.4";
  +  version = "0.14.7";
     disabled = pythonOlder "3.6";
   
     src = fetchFromGitHub {
       owner = "encode";
       repo = pname;
       rev = version;
  -    sha256 = "19zsg8ijw0s1722ka67mjxx5z07lx9jq36z97l1fa6z1129wq240";
  +    sha256 = "sha256-h+3MfP1p/ifN0mF/xxrOKPTjD4Q7WzRh94YO4DYSuXE=";
     };
  +
  +  postPatch = ''
  +    substituteInPlace setup.py \
  +      --replace "h11>=0.11,<0.13" "h11>=0.11,<0.14"
  +  '';
   
     propagatedBuildInputs = [
       anyio
  
positive.code:     h11
      h2
      sniffio
    ];
  
    checkInputs = [
  
negative.code: , pytest-cov
  , pytest-httpbin
  , sniffio
  , socksio
  , trio
  , trustme
  , uvicorn
  