anchor.diff: -{ lib, stdenv, fetchFromGitHub, gtk3, pantheon, breeze-icons, gnome-icon-theme, hicolor-icon-theme }:
  +{ lib, stdenv, fetchFromGitHub, fetchurl, gtk3, pantheon, breeze-icons, gnome-icon-theme, hicolor-icon-theme, papirus-folders, color ? "blue" }:
   
   stdenv.mkDerivation rec {
     pname = "papirus-icon-theme";
  
positive.code:     mv {,e}Papirus* $out/share/icons
  
      for theme in $out/share/icons/*; do
        gtk-update-icon-cache $theme
      done
      runHook postInstall
    '';
  
  
negative.code:     sha256 = "sha256-HJb77ArzwMX9ZYTp0Ffxxtst1/xhPAa+eEP5n950DSs=";
    };
  
    nativeBuildInputs = [ gtk3 papirus-folders ];
  
    propagatedBuildInputs = [
      pantheon.elementary-icon-theme
  