anchor.diff:    meta = with lib; {
       description = "Flat Design theme for GTK based desktop environments";
       homepage = "https://github.com/vinceliuice/Canta-theme";
  -    license = licenses.gpl2;
  +    license = licenses.gpl2Only;
       platforms = platforms.linux; # numix-icon-theme-circle unavailable in darwin
       maintainers = [ maintainers.romildo ];
     };
  
positive.code: { lib, stdenv
  , fetchFromGitHub
  , gdk-pixbuf
  , librsvg
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "canta-theme";
    version = "2021-09-08";
  
    src = fetchFromGitHub {
      owner = "vinceliuice";
      repo = pname;
      rev = version;
      sha256 = "05h42nrggb6znzjcbh4lqqfcm41h4r85n3vwimp3l4lq5p90igr2";
    };
  
    nativeBuildInputs = [
  