anchor.diff:      owner = "mypaint";
       repo = "libmypaint";
       rev = "v${version}";
  -    sha256 = "06szsadj589vlvn33gzybygdknsaahr4cpigh2xyg8mr3h9ngqrl";
  +    sha256 = "1pxx8fjdabcindxhzgbhg4p7yanl4ihbd8kq71y2nyi9dqsjr2fw";
     };
   
     nativeBuildInputs = [
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "libmypaint";
    version = "1.5.0";
  
    outputs = [ "out" "dev" ];
  
  
negative.code:   preConfigure = "./autogen.sh";
  
    meta = with stdenv.lib; {
      homepage = "http://mypaint.org/";
      description = "Library for making brushstrokes which is used by MyPaint and other projects";
      license = licenses.isc;
      maintainers = with maintainers; [ goibhniu jtojnar ];
  