anchor.diff:  
   mkDerivation rec {
     name = "megasync-${version}";
  -  version = "4.1.1.0";
  +  version = "4.2.3.0";
   
     src = fetchFromGitHub {
       owner = "meganz";
       repo = "MEGAsync";
       rev = "v${version}_Linux";
  -    sha256 = "0lc228q3s9xp78dxjn22g6anqlsy1hi7a6yfs4q3l6gyfc3qcxl2";
  +    sha256 = "0l4yfrxjb62vc9dnlzy8rjqi68ga1bys5x5rfzs40daw13yf1adv";
       fetchSubmodules = true;
     };
   
  
positive.code:     doxygen
      lsb-release
      pkgconfig
      qmake
      qttools
      swig
    ];
  
negative.code: , lsb-release
  , mkDerivation
  , pkgconfig
  , qtbase
  , qttools
  , sqlite
  , swig
  