anchor.diff: -{ stdenv, fetchgit, pkgconfig, xfce4-dev-tools }:
  +{ stdenv, fetchgit, pkgconfig, xfce4-dev-tools, hicolor-icon-theme }:
   
   { category, pname, version, rev ? "${pname}-${version}", sha256, ... } @ args:
   
  
positive.code: 
      enableParallelBuilding = true;
      outputs = [ "out" "dev" ];
  
      preFixup = ''rm $out/share/icons/hicolor/icon-theme.cache || true'';
  
      meta = with stdenv.lib; {
        homepage = "https://git.xfce.org/${category}/${pname}/about";
  
negative.code:     name = "${pname}-${version}";
  
      nativeBuildInputs = [ pkgconfig xfce4-dev-tools ];
      buildInputs = [ hicolor-icon-theme ];
      configureFlags = [ "--enable-maintainer-mode" ];
  
      src = fetchgit {
  