anchor.diff:    preConfigure = "./autogen.sh";
   
     meta = with stdenv.lib; {
  -    homepage = http://mypaint.org/;
  +    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 ];
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "libmypaint";
    version = "1.5.0";
  
    outputs = [ "out" "dev" ];
  
  
negative.code:     owner = "mypaint";
      repo = "libmypaint";
      rev = "v${version}";
      sha256 = "1pxx8fjdabcindxhzgbhg4p7yanl4ihbd8kq71y2nyi9dqsjr2fw";
    };
  
    nativeBuildInputs = [
  