anchor.diff:      gtk3
     ];
   
  -  postFixup =  ''
  -    gtk-update-icon-cache $out/share/icons/*
  -  '';
  -
     dontDropIconThemeCache = true;
   
     installPhase = ''
  +    runHook preInstall
  +
       mkdir -p $out
       mv usr/share $out
  +
  +    for theme in $out/share/icons/*; do
  +      gtk-update-icon-cache $theme
  +    done
  +
  +    runHook postInstall
     '';
   
     meta = with stdenv.lib; {
  
positive.code:     sha256 = "1c2a79ylk363i982czwwqcwc7cw6dyzlqphcypqm6nll7xlafq8s";
    };
  
    propagatedUserEnvPkgs = [
      gnome3.adwaita-icon-theme
      hicolor-icon-theme
    ];
  
  
negative.code: { fetchFromGitHub
  , stdenv
  , gnome3
  , gnome-icon-theme
  , hicolor-icon-theme
  , gtk3
  }:
  