anchor.diff:    buildPhase = "true";
   
     installPhase = ''
  -    HOME="$NIX_BUILD_ROOT"  # shut up inkscape's warnings
  +    runHook preInstall
       for theme in *.colors; do
         make THEME="''${theme/.colors/}" install
       done
  +    runHook postInstall
     '';
   
     meta = with lib; {
  
positive.code:     '';
      homepage = "https://github.com/Ferdi265/numix-solarized-gtk-theme";
      downloadPage = "https://github.com/Ferdi265/numix-solarized-gtk-theme/releases";
      license = licenses.gpl3;
      platforms = platforms.linux;
      maintainers = [ maintainers.offline ];
    };
  
negative.code: { lib, stdenv, fetchFromGitHub, python3, sassc, glib, gdk-pixbuf, inkscape, gtk-engine-murrine }:
  
  stdenv.mkDerivation rec {
    pname = "numix-solarized-gtk-theme";
    version = "20210522";
  
    src = fetchFromGitHub {
      owner = "Ferdi265";
      repo = pname;
      rev = version;
      sha256 = "0hin73fmfir4w1z0j87k5hahhf2blhcq4r7gf89gz4slnl18cvjh";
    };
  
    nativeBuildInputs = [ python3 sassc glib gdk-pixbuf inkscape ];
  