anchor.diff:  
     doCheck = stdenv.hostPlatform.isx86_64;
   
  -  postInstall = ''
  +  postInstall = lib.optionalString doCheck ''
       mkdir -p $test/{bin,test}
       cp -a test $test
       pushd $test/test
  
positive.code:     url = "mirror://kernel/linux/bluetooth/${pname}-${version}.tar.xz";
      sha256 = "1p2ncvjz6alr9n3l5wvq2arqgc7xjs6dqyar1l9jp0z8cfgapkb8";
    };
  
    pythonPath = with python3.pkgs; [
      dbus-python
      pygobject3
      recursivePthLoader
    ];
  
    buildInputs = [
      alsaLib
  
negative.code:     python3.pkgs.wrapPython
    ];
  
    outputs = [ "out" "dev" ] ++ lib.optional doCheck "test";
  
    postPatch = ''
      substituteInPlace tools/hid2hci.rules \
  