anchor.diff:  { lib, stdenv, fetchFromGitHub, python3, sassc, glib, gdk-pixbuf, inkscape, gtk-engine-murrine }:
   
   stdenv.mkDerivation rec {
  -  version = "20200910";
     pname = "numix-solarized-gtk-theme";
  +  version = "20210522";
   
     src = fetchFromGitHub {
       owner = "Ferdi265";
  -    repo = "numix-solarized-gtk-theme";
  +    repo = pname;
       rev = version;
  -    sha256 = "05h1563sy6sfz76jadxsf730mav6bbjsk9xnadv49r16b8n8p9a9";
  +    sha256 = "0hin73fmfir4w1z0j87k5hahhf2blhcq4r7gf89gz4slnl18cvjh";
     };
   
     nativeBuildInputs = [ python3 sassc glib gdk-pixbuf inkscape ];
  
positive.code:   buildPhase = "true";
  
    installPhase = ''
      HOME="$NIX_BUILD_ROOT"  # shut up inkscape's warnings
      for theme in *.colors; do
        make THEME="''${theme/.colors/}" install
      done
    '';
  
    meta = with lib; {
  
negative.code:     '';
      homepage = "https://github.com/Ferdi265/numix-solarized-gtk-theme";
      downloadPage = "https://github.com/Ferdi265/numix-solarized-gtk-theme/releases";
      license = licenses.gpl3Only;
      platforms = platforms.linux;
      maintainers = [ maintainers.offline ];
    };
  