anchor.diff:      sha256 = "sha256-HJb77ArzwMX9ZYTp0Ffxxtst1/xhPAa+eEP5n950DSs=";
     };
   
  -  nativeBuildInputs = [ gtk3 ];
  +  nativeBuildInputs = [ gtk3 papirus-folders ];
   
     propagatedBuildInputs = [
       pantheon.elementary-icon-theme
  
positive.code: { lib, stdenv, fetchFromGitHub, gtk3, pantheon, breeze-icons, gnome-icon-theme, hicolor-icon-theme }:
  
  stdenv.mkDerivation rec {
    pname = "papirus-icon-theme";
  
negative.code:     mv {,e}Papirus* $out/share/icons
  
      for theme in $out/share/icons/*; do
        ${papirus-folders}/bin/papirus-folders -t $theme -o -C ${color}
        gtk-update-icon-cache $theme
      done
  
      runHook postInstall
    '';
  
  