anchor.diff:    meta = with lib; {
       description = "Marwaita GTK theme with Peppermint Os Linux style";
       homepage = "https://www.pling.com/p/1399569/";
  -    license = licenses.gpl3;
  +    license = licenses.gpl3Only;
       platforms = platforms.unix;
       maintainers = [ maintainers.romildo ];
     };
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "marwaita-peppermint";
    version = "0.6";
  
    src = fetchFromGitHub {
      owner = "darkomarko42";
      repo = pname;
      rev = version;
      sha256 = "0mhkkx2qa66z4b2h5iynhy63flwdf6b2phd21r1j8kp4m08dynms";
    };
  
    buildInputs = [
  
negative.code: { lib
  , stdenv
  , fetchFromGitHub
  , gdk-pixbuf
  , gtk-engine-murrine
  