anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "libmypaint";
  -  version = "1.5.1";
  +  version = "1.6.0";
   
     outputs = [ "out" "dev" ];
   
  
positive.code: 
    doCheck = true;
  
    postPatch = ''
      sed 's|python2|python|' -i autogen.sh
    '';
  
    preConfigure = "./autogen.sh";
  
    meta = with stdenv.lib; {
  
negative.code:     owner = "mypaint";
      repo = "libmypaint";
      rev = "v${version}";
      sha256 = "1fdyywm915mmilfmzp7lz4rnmm05kkw0adrdqpqi4n8icp4d530g";
    };
  
    nativeBuildInputs = [
  